Hi, maintainers. The attached tiny patch fixes incorrect options passed to unzstd in unpack() in lib/src_prep.cygpart. unpack() in lib/src_prep.cygpart calls unzstd for a *.zst file as `unzstd -qo file.zst` Then, an error occurrs as 'stdin is a console, aborting'. There are some choices to fix it, this patch aligns with handling .gz and .bz2. -- Yasutaka ATARASHI