--- lib/src_prep.cygpart.orig	2023-07-29 17:00:50.409163400 +0900
+++ lib/src_prep.cygpart	2023-07-29 17:01:16.683974800 +0900
@@ -138,7 +138,8 @@
 				;;
 			*.zst)
 				check_prog_req zstd;
-				unpack_cmd="unzstd -qo";
+				unpack_cmd="unzstd -c";
+				unpack_out="${unpack_file_name%.zst}";
 				;;
 			*.7z)
 				if check_prog 7zr