On Mon, Aug 19, 2019 at 12:39:47PM -0500, Martin McCormick wrote: > The problem is that in 2002, gzip apparently worked > differently so if you use modern gzip on it, it just complains
Sounds unlikely. > $ gzip -d rc.custom.gz > > gzip: rc.custom.gz: not in gzip format Where did you get this file? What does file(1) say about it? How about gzip --test? I think it's more likely that your file is corrupt, than that gzip has decided to become incompatible with itself.
