BW> I guess >> "%3%2" should redirect output to a temporary file, and
 BW> Mystic's archive viewer reads that (if it exists).
 BW> 
 BW> Are there any specs on what kind of output format it can "parse"?
 BW> Because I guess all archivers are different?

Correct for external/unsupported archive formats, Mystic executes the view command line, and then displays the file at %3%2.  There is nothing to parse it just displays whatever the view command puts in that file.

Its allows you to use the archive utility itself to create a listing, or any other utility to do so.

... I wish life had a scroll-back buffer.

--- Mystic BBS v1.12 A47 2021/07/31 (Windows/64)