diff --git a/extr b/extr
index f55d2e4..54b254c 100755
--- a/extr
+++ b/extr
@@ -15,6 +15,9 @@
 
 #Copyright 2019-2021 rexy712
 
+export EXTR_MODULE_PATH=("$HOME/.bashfiles/extr-modules" "/etc/extr-modules")
+export EXTR_LOADED_MODULES=()
+
 function extr_usage() {
 	if [ -n "$1" ];then
 		echo "$1" >&2
@@ -32,6 +35,28 @@ function extr_usage() {
 	echo "There is NO WARRANTY, to the extent permitted by law."
 	echo "Copyright (C) 2019-2021 rexy712"
 }
+
+function extr_is_module_registered(){
+	eval [ -n '"$'"EXTR_MODULE_$1"'"' ]
+}
+function extr_register_module(){
+	if ! extr_is_module_registered "$1";then
+		eval export "EXTR_MODULE_$1"=1
+		EXTR_LOADED_MODULES+=("$1")
+	fi
+}
+function extr_register_extensions(){
+	extr_is_module_registered "$1" || return 1
+
+	eval export "EXTR_EXTENSIONS_$1"='$'"2"
+}
+function regex_match(){
+	local haystack="$1"
+	local needle="$2"
+
+	grep -Eqs "$needle" <<< "$haystack"
+}
+
 function extr_unsupported_file(){
 	echo "Unsupported format. Ignoring." >&2
 	return 0
@@ -120,206 +145,27 @@ function fatal_error(){
 	exit 1
 }
 
-function do_tar(){
-	local flags=()
-	if [ "$verbosity" == 1 ];then
-		#flags+=("--checkpoint")
-		:;
-	elif [ "$verbosity" == 2 ];then
-		flags+=("--verbose")
-	fi
-	if [ -n "$overwrite" ];then
-		flags+=("--overwrite")
-	else
-		flags+=("--keep-old-files")
-	fi
-	if [ -n "$outloc" ];then
-		flags+=("-C" "$outloc")
-	fi
-	tar "${flags[@]}" -xf "$file" "${passthrough_args[@]}"
-}
-function do_bz2(){
-	local flags=()
-	if [ "$verbosity" == 0 ];then
-		flags+=("--quiet")
-	elif [ "$verbosity" == 2 ];then
-		flags+=("--verbose")
-	fi
-	if [ -n "$overwrite" ];then
-		flags+=("--force")
-	fi
-	if [ -n "$outloc" ];then
-		local fileout="${outloc}/$(basename "${file:0:-4}")"
-		if [ -e "${fileout}" ] && [ -z "$overwrite" ];then
-			echo "Could not decompress $file; output file exists" >&2
-			return 0
-		fi
-		bunzip2 -dk "${flags[@]}" "${passthrough_args[@]}" "$file" --stdout > "${fileout}"
-	else
-		bunzip2 -dk "${flags[@]}" "${passthrough_args[@]}" "$file"
-	fi
-}
-function do_gz(){
-	local flags=()
-	if [ "$verbosity" == 0 ];then
-		flags+=("--quiet")
-	elif [ "$verbosity" == 2 ];then
-		flags+=("--verbose")
-	fi
-	if [ -n "$overwrite" ];then
-		flags+=("--force")
-	fi
-	if [ -n "$outloc" ];then
-		local fileout="${outloc}/$(basename "${file:0:-3}")"
-		if [ -e "${fileout}" ] && [ -z "$overwrite" ];then
-			echo "Could not decompress $file; output file exists" >&2
-			return 0
-		fi
-		gunzip -dk "${flags[@]}" "${passthrough_args[@]}" "$file" --stdout > "${fileout}"
-	else
-		gunzip -dk "${flags[@]}" "${passthrough_args[@]}" "$file"
-	fi
-}
-function do_zip(){
-	local flags=()
-	if [ "$verbosity" -lt "2" ];then
-		flags+=("-q")
-	fi
-	if [ -n "$overwrite" ];then
-		flags+=("-o")
-	fi
-	if [ -n "$outloc" ];then
-		flags+=("-d" "$outloc")
-	fi
-	unzip "${flags[@]}" "${passthrough_args[@]}" "$file"
-}
-function do_uncompress(){
-	local flags=()
-	if [ "$verbosity" == 2 ];then
-		flags+=("-v")
-	fi
-	if [ -n "$overwrite" ];then
-		flags+=("-f")
-	fi
-	if [ -n "$outloc" ];then
-		local fileout="${outloc}/$(basename "${file:0:-2}")"
-		if [ -e "${fileout}" ] && [ -z "$overwrite" ];then
-			echo "Could not decompress $file; output file exists" >&2
-			return 0
-		fi
-		uncompress "${flags[@]}" "${passthrough_args[@]}" "$file" -c > "${fileout}"
-	else
-		uncompress "${flags[@]}" "${passthrough_args[@]}" "$file"
-	fi
-}
-function do_7zip(){
-	local flags=()
-	if [ -n "$outloc" ];then
-		flags+=("-o${outloc}")
-	fi
-	if [ -n "$overwrite" ];then
-		flags+=("-y")
-	fi
-	if [ "$verbosity" == 0 ];then
-		7za x "${flags[@]}" "${passthrough_args[@]}" "$file" >/dev/null 2>&1
-	else
-		7za x "${flags[@]}" "${passthrough_args[@]}" "$file"
-	fi
-}
-function do_rar(){
-	local flags=()
-	if [ "$verbosity" == 0 ];then
-		flags+=("-inul")
-	elif [ "$verbosity" == 2 ];then
-		flags+=("-ierr")
-	fi
-	if [ -n "$overwrite" ];then
-		flags+=("-o+")
-	else
-		flags+=("-o-")
-	fi
-	if [ -n "$outloc" ];then
-		local fileout="${outloc}/$(basename "${file:0:-4}")"
-		if [ -e "${fileout}" ] && [ -z "$overwrite" ];then
-			echo "Could not decompress $file; output file exists" >&2
-			return 0
-		fi
-		unrar "${flags[@]}" p "${passthrough_args[@]}" "$file" > "${fileout}"
-	else
-		unrar "${flags[@]}" x "${passthrough_args[@]}" "$file"
-	fi
-}
-function do_zstd(){
-	local flags=()
-	if [ "$verbosity" == 0 ];then
-		flags+=("--quiet")
-	elif [ "$verbosity" == 2 ];then
-		flags+=("-v")
-	fi
-	if [ -n "$overwrite" ];then
-		flags+=("-f")
-	fi
-	if [ -n "$outloc" ];then
-		local fileout="${outloc}/$(basename "${file:0:-5}")"
-		if [ -e "${fileout}" ] && [ -z "$overwrite" ];then
-			echo "Could not decompress $file; output file exists" >&2
-			return 0
-		fi
-		unzstd -dk "${flags[@]}" "${passthrough_args[@]}" "$file" --stdout > "${fileout}"
-	else
-		unzstd -dk "${flags[@]}" "${passthrough_args[@]}" "$file"
-	fi
-}
-function do_xz(){
-	local flags=()
-	if [ "$verbosity" == 0 ];then
-		flags+=("--quiet")
-	elif [ "$verbosity" == 2 ];then
-		flags+=("--verbose")
-	fi
-	if [ -n "$overwrite" ];then
-		flags+=("--force")
-	fi
-	if [ -n "$outloc" ];then
-		local fileout="${outloc}/$(basename "${file:0:-3}")"
-		if [ -e "${fileout}" ] && [ -z "$overwrite" ];then
-			echo "Could not decompress $file; output file exists" >&2
-			return 0
-		fi
-		xz -dk "${flags[@]}" "${passthrough_args[@]}" "$file" --stdout > "${fileout}"
-	else
-		xz -dk "${flags[@]}" "${passthrough_args[@]}" "$file"
-	fi
-}
-
 function do_file_extension(){
 	local file="$1"
-	case "$file" in
-		*.tar.*|*.tbz2|*.tgz|*.txz|*.tar|*.tarZ|*.targz|*.tarxz|*.tzst)
-			do_tar;;
-		*.bz2)
-			do_bz2;;
-		*.gz)
-			do_gz;;
-		*.zip)
-			do_zip;;
-		*.Z)
-			do_uncompress;;
-		*.7z)
-			do_7zip;;
-		*.rar)
-			do_rar;;
-		*.zst)
-			do_zstd;;
-		*.xz)
-			do_xz;;
-		*)
-			extr_unsupported_file || return -1;;
-	esac
-	retval=$?
+	for module in "${EXTR_LOADED_MODULES[@]}";do
+		eval regex_match "$file" '$'"EXTR_EXTENSIONS_$module"
+		if [ $? -eq 0 ];then
+			eval "do_$module"
+			retval=$?
+			break
+		fi
+	done
 	return 0
 }
 
+function load_modules(){
+	for dir in "${EXTR_MODULE_PATH[@]}";do
+		[ ! -d "$dir" ] && continue
+		for file in $(ls "$dir");do
+			source "${dir}/${file}"
+		done
+	done
+}
 function _extr(){
 	local verbosity=
 	local overwrite=
@@ -335,6 +181,7 @@ function _extr(){
 	if [ "${#filenames[@]}" == 0 ];then
 		extr_usage "Missing filenames!"
 	fi
+	load_modules
 	for file in "${filenames[@]}";do
 		if [ -f "$file" ];then
 			do_file_extension "$file"
diff --git a/extr-modules/00-tar b/extr-modules/00-tar
new file mode 100644
index 0000000..6aee6b5
--- /dev/null
+++ b/extr-modules/00-tar
@@ -0,0 +1,38 @@
+#!/bin/bash
+
+#This program is free software: you can redistribute it and/or modify
+#it under the terms of the GNU General Public License as published by
+#the Free Software Foundation, either version 3 of the License, or
+#(at your option) any later version.
+
+#This program is distributed in the hope that it will be useful,
+#but WITHOUT ANY WARRANTY; without even the implied warranty of
+#MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#GNU General Public License for more details.
+
+#You should have received a copy of the GNU General Public License
+#along with this program. If not, see <http://www.gnu.org/licenses/>.
+
+#Copyright 2021 rexy712
+
+extr_register_module 'tar'
+extr_register_extensions 'tar' '\.tar\..*$|\.tbz2$|\.tgz$|\.txz$|\.tar$|\.tarZ$|\.targz$|\.tarxz$|\.tzst$'
+
+do_tar(){
+	local flags=()
+	if [ "$verbosity" == 1 ];then
+		#flags+=("--checkpoint")
+		:;
+	elif [ "$verbosity" == 2 ];then
+		flags+=("--verbose")
+	fi
+	if [ -n "$overwrite" ];then
+		flags+=("--overwrite")
+	else
+		flags+=("--keep-old-files")
+	fi
+	if [ -n "$outloc" ];then
+		flags+=("-C" "$outloc")
+	fi
+	tar "${flags[@]}" -xf "$file" "${passthrough_args[@]}"
+}
diff --git a/extr-modules/10-7zip b/extr-modules/10-7zip
new file mode 100644
index 0000000..6917e17
--- /dev/null
+++ b/extr-modules/10-7zip
@@ -0,0 +1,34 @@
+#!/bin/bash
+
+#This program is free software: you can redistribute it and/or modify
+#it under the terms of the GNU General Public License as published by
+#the Free Software Foundation, either version 3 of the License, or
+#(at your option) any later version.
+
+#This program is distributed in the hope that it will be useful,
+#but WITHOUT ANY WARRANTY; without even the implied warranty of
+#MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#GNU General Public License for more details.
+
+#You should have received a copy of the GNU General Public License
+#along with this program. If not, see <http://www.gnu.org/licenses/>.
+
+#Copyright 2021 rexy712
+
+extr_register_module '7zip'
+extr_register_extensions '7zip' '\.7z$'
+
+function do_7zip(){
+	local flags=()
+	if [ -n "$outloc" ];then
+		flags+=("-o${outloc}")
+	fi
+	if [ -n "$overwrite" ];then
+		flags+=("-y")
+	fi
+	if [ "$verbosity" == 0 ];then
+		7za x "${flags[@]}" "${passthrough_args[@]}" "$file" >/dev/null 2>&1
+	else
+		7za x "${flags[@]}" "${passthrough_args[@]}" "$file"
+	fi
+}
diff --git a/extr-modules/10-bz2 b/extr-modules/10-bz2
new file mode 100644
index 0000000..1772d50
--- /dev/null
+++ b/extr-modules/10-bz2
@@ -0,0 +1,46 @@
+#!/bin/bash
+
+#This program is free software: you can redistribute it and/or modify
+#it under the terms of the GNU General Public License as published by
+#the Free Software Foundation, either version 3 of the License, or
+#(at your option) any later version.
+
+#This program is distributed in the hope that it will be useful,
+#but WITHOUT ANY WARRANTY; without even the implied warranty of
+#MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#GNU General Public License for more details.
+
+#You should have received a copy of the GNU General Public License
+#along with this program. If not, see <http://www.gnu.org/licenses/>.
+
+#Copyright 2021 rexy712
+
+extr_register_module 'bz2'
+extr_register_extensions 'bz2' '\.bz2$'
+
+function do_bz2(){
+	local flags=()
+	if [ "$verbosity" == 0 ];then
+		flags+=("--quiet")
+	elif [ "$verbosity" == 2 ];then
+		flags+=("--verbose")
+	fi
+	if [ -n "$overwrite" ];then
+		flags+=("--force")
+	fi
+	local fileout=
+	if [ -n "$outloc" ];then
+		fileout="${outloc}/$(basename "${file:0:-4}")"
+	else
+		fileout="${PWD}/$(basename "${file:0:-4}")"
+	fi
+	if [ -e "${fileout}" ] && [ -z "$overwrite" ];then
+		echo "Could not decompress $file; output file exists" >&2
+		return 1
+	fi
+	if [ ! -r "${file}" ] || [ ! -w "$(dirname "${fileout}")" ];then
+		echo "${file} decompress failed; permission denied"
+		return 1
+	fi
+	bunzip2 -dk "${flags[@]}" "${passthrough_args[@]}" "$file" --stdout > "${fileout}"
+}
diff --git a/extr-modules/10-deb b/extr-modules/10-deb
new file mode 100644
index 0000000..f8eea24
--- /dev/null
+++ b/extr-modules/10-deb
@@ -0,0 +1,33 @@
+#!/bin/bash
+
+#This program is free software: you can redistribute it and/or modify
+#it under the terms of the GNU General Public License as published by
+#the Free Software Foundation, either version 3 of the License, or
+#(at your option) any later version.
+
+#This program is distributed in the hope that it will be useful,
+#but WITHOUT ANY WARRANTY; without even the implied warranty of
+#MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#GNU General Public License for more details.
+
+#You should have received a copy of the GNU General Public License
+#along with this program. If not, see <http://www.gnu.org/licenses/>.
+
+#Copyright 2021 rexy712
+
+extr_register_module 'deb'
+extr_register_extensions 'deb' '\.deb$'
+
+function do_deb(){
+	local flags=()
+	if [ "$verbosity" == 2 ];then
+		flags+=("-v")
+	fi
+	local outdir=
+	if [ -n "$outloc" ];then
+		outdir="$outloc"
+	else
+		outdir="$PWD"
+	fi
+	ar x "${flags[@]}" "${passthrough_args[@]}" "$file" --output "${outdir}"
+}
diff --git a/extr-modules/10-gz b/extr-modules/10-gz
new file mode 100644
index 0000000..034587d
--- /dev/null
+++ b/extr-modules/10-gz
@@ -0,0 +1,46 @@
+#!/bin/bash
+
+#This program is free software: you can redistribute it and/or modify
+#it under the terms of the GNU General Public License as published by
+#the Free Software Foundation, either version 3 of the License, or
+#(at your option) any later version.
+
+#This program is distributed in the hope that it will be useful,
+#but WITHOUT ANY WARRANTY; without even the implied warranty of
+#MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#GNU General Public License for more details.
+
+#You should have received a copy of the GNU General Public License
+#along with this program. If not, see <http://www.gnu.org/licenses/>.
+
+#Copyright 2021 rexy712
+
+extr_register_module 'gz'
+extr_register_extensions 'gz' '\.gz$'
+
+function do_gz(){
+	local flags=()
+	if [ "$verbosity" == 0 ];then
+		flags+=("--quiet")
+	elif [ "$verbosity" == 2 ];then
+		flags+=("--verbose")
+	fi
+	if [ -n "$overwrite" ];then
+		flags+=("--force")
+	fi
+	local fileout=
+	if [ -n "$outloc" ];then
+		fileout="${outloc}/$(basename "${file:0:-3}")"
+	else
+		fileout="${PWD}/$(basename "${file:0:-3}")"
+	fi
+	if [ -e "${fileout}" ] && [ -z "$overwrite" ];then
+		echo "Could not decompress $file; output file exists" >&2
+		return 1
+	fi
+	if [ ! -r "${file}" ] || [ ! -w "$(dirname "${fileout}")" ];then
+		echo "${file} decompress failed; permission denied"
+		return 1
+	fi
+	gunzip -dk "${flags[@]}" "${passthrough_args[@]}" "$file" --stdout > "${fileout}"
+}
diff --git a/extr-modules/10-rar b/extr-modules/10-rar
new file mode 100644
index 0000000..ad164d7
--- /dev/null
+++ b/extr-modules/10-rar
@@ -0,0 +1,40 @@
+#!/bin/bash
+
+#This program is free software: you can redistribute it and/or modify
+#it under the terms of the GNU General Public License as published by
+#the Free Software Foundation, either version 3 of the License, or
+#(at your option) any later version.
+
+#This program is distributed in the hope that it will be useful,
+#but WITHOUT ANY WARRANTY; without even the implied warranty of
+#MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#GNU General Public License for more details.
+
+#You should have received a copy of the GNU General Public License
+#along with this program. If not, see <http://www.gnu.org/licenses/>.
+
+#Copyright 2021 rexy712
+
+extr_register_module 'rar'
+extr_register_extensions 'rar' '\.rar$'
+
+function do_rar(){
+	local flags=()
+	if [ "$verbosity" == 0 ];then
+		flags+=("-inul")
+	elif [ "$verbosity" == 2 ];then
+		flags+=("-ierr")
+	fi
+	if [ -n "$overwrite" ];then
+		flags+=("-o+")
+	else
+		flags+=("-o-")
+	fi
+	local outdir=
+	if [ -n "$outloc" ];then
+		outdir="${outloc}/"
+	else
+		outdir="${PWD}/"
+	fi
+	unrar "${flags[@]}" x "${passthrough_args[@]}" "$file" "${outdir}"
+}
diff --git a/extr-modules/10-uncompress b/extr-modules/10-uncompress
new file mode 100644
index 0000000..ebc4918
--- /dev/null
+++ b/extr-modules/10-uncompress
@@ -0,0 +1,44 @@
+#!/bin/bash
+
+#This program is free software: you can redistribute it and/or modify
+#it under the terms of the GNU General Public License as published by
+#the Free Software Foundation, either version 3 of the License, or
+#(at your option) any later version.
+
+#This program is distributed in the hope that it will be useful,
+#but WITHOUT ANY WARRANTY; without even the implied warranty of
+#MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#GNU General Public License for more details.
+
+#You should have received a copy of the GNU General Public License
+#along with this program. If not, see <http://www.gnu.org/licenses/>.
+
+#Copyright 2021 rexy712
+
+extr_register_module 'uncompress'
+extr_register_extensions 'uncompress' '\.Z$'
+
+function do_uncompress(){
+	local flags=()
+	if [ "$verbosity" == 2 ];then
+		flags+=("-v")
+	fi
+	if [ -n "$overwrite" ];then
+		flags+=("-f")
+	fi
+	local fileout=
+	if [ -n "$outloc" ];then
+		fileout="${outloc}/$(basename "${file:0:-2}")"
+	else
+		fileout="${PWD}/$(basename "${file:0:-2}")"
+	fi
+	if [ -e "${fileout}" ] && [ -z "$overwrite" ];then
+		echo "Could not decompress $file; output file exists" >&2
+		return 0
+	fi
+	if [ ! -r "${file}" ] || [ ! -w "$(dirname "${fileout}")" ];then
+		echo "${file} decompress failed; permission denied"
+		return 1
+	fi
+	uncompress "${flags[@]}" "${passthrough_args[@]}" "$file" -c > "${fileout}"
+}
diff --git a/extr-modules/10-xz b/extr-modules/10-xz
new file mode 100644
index 0000000..6f08847
--- /dev/null
+++ b/extr-modules/10-xz
@@ -0,0 +1,45 @@
+#!/bin/bash
+
+#This program is free software: you can redistribute it and/or modify
+#it under the terms of the GNU General Public License as published by
+#the Free Software Foundation, either version 3 of the License, or
+#(at your option) any later version.
+
+#This program is distributed in the hope that it will be useful,
+#but WITHOUT ANY WARRANTY; without even the implied warranty of
+#MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#GNU General Public License for more details.
+
+#You should have received a copy of the GNU General Public License
+#along with this program. If not, see <http://www.gnu.org/licenses/>.
+
+#Copyright 2021 rexy712
+
+extr_register_module 'xz'
+extr_register_extensions 'xz' '\.xz$'
+
+function do_xz(){
+	local flags=()
+	if [ "$verbosity" == 0 ];then
+		flags+=("--quiet")
+	elif [ "$verbosity" == 2 ];then
+		flags+=("--verbose")
+	fi
+	if [ -n "$overwrite" ];then
+		flags+=("--force")
+	fi
+	if [ -n "$outloc" ];then
+		fileout="${outloc}/$(basename "${file:0:-3}")"
+	else
+		fileout="${PWD}/$(basename "${file:0:-3}")"
+	fi
+	if [ -e "${fileout}" ] && [ -z "$overwrite" ];then
+		echo "Could not decompress $file; output file exists" >&2
+		return 1
+	fi
+	if [ ! -r "${file}" ] || [ ! -w "$(dirname "${fileout}")" ];then
+		echo "${file} decompress failed; permission denied"
+		return 1
+	fi
+	xz -dk "${flags[@]}" "${passthrough_args[@]}" "$file" --stdout > "${fileout}"
+}
diff --git a/extr-modules/10-zip b/extr-modules/10-zip
new file mode 100644
index 0000000..c56ec73
--- /dev/null
+++ b/extr-modules/10-zip
@@ -0,0 +1,33 @@
+#!/bin/bash
+
+#This program is free software: you can redistribute it and/or modify
+#it under the terms of the GNU General Public License as published by
+#the Free Software Foundation, either version 3 of the License, or
+#(at your option) any later version.
+
+#This program is distributed in the hope that it will be useful,
+#but WITHOUT ANY WARRANTY; without even the implied warranty of
+#MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#GNU General Public License for more details.
+
+#You should have received a copy of the GNU General Public License
+#along with this program. If not, see <http://www.gnu.org/licenses/>.
+
+#Copyright 2021 rexy712
+
+extr_register_module 'zip'
+extr_register_extensions 'zip' '\.zip$'
+
+function do_zip(){
+	local flags=()
+	if [ "$verbosity" -lt "2" ];then
+		flags+=("-q")
+	fi
+	if [ -n "$overwrite" ];then
+		flags+=("-o")
+	fi
+	if [ -n "$outloc" ];then
+		flags+=("-d" "$outloc")
+	fi
+	unzip "${flags[@]}" "${passthrough_args[@]}" "$file"
+}
diff --git a/extr-modules/10-zstd b/extr-modules/10-zstd
new file mode 100644
index 0000000..2facecc
--- /dev/null
+++ b/extr-modules/10-zstd
@@ -0,0 +1,46 @@
+#!/bin/bash
+
+#This program is free software: you can redistribute it and/or modify
+#it under the terms of the GNU General Public License as published by
+#the Free Software Foundation, either version 3 of the License, or
+#(at your option) any later version.
+
+#This program is distributed in the hope that it will be useful,
+#but WITHOUT ANY WARRANTY; without even the implied warranty of
+#MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#GNU General Public License for more details.
+
+#You should have received a copy of the GNU General Public License
+#along with this program. If not, see <http://www.gnu.org/licenses/>.
+
+#Copyright 2021 rexy712
+
+extr_register_module 'zstd'
+extr_register_extensions 'zstd' '\.zstd$'
+
+function do_zstd(){
+	local flags=()
+	if [ "$verbosity" == 0 ];then
+		flags+=("--quiet")
+	elif [ "$verbosity" == 2 ];then
+		flags+=("-v")
+	fi
+	if [ -n "$overwrite" ];then
+		flags+=("-f")
+	fi
+	local fileout=
+	if [ -n "$outloc" ];then
+		fileout="${outloc}/$(basename "${file:0:-5}")"
+	else
+		fileout="${PWD}/$(basename "${file:0:-5}")"
+	fi
+	if [ -e "${fileout}" ] && [ -z "$overwrite" ];then
+		echo "Could not decompress $file; output file exists" >&2
+		return 1
+	fi
+	if [ ! -r "${file}" ] || [ ! -w "$(dirname "${fileout}")" ];then
+		echo "${file} decompress failed; permission denied"
+		return 1
+	fi
+	unzstd -dk "${flags[@]}" "${passthrough_args[@]}" "$file" --stdout > "${fileout}"
+}