Many a moon ago, I traded and archived lots of live “bootleg” shows from many artists that I archived in Shorten .shn format. I’m sure at the time it seemed like a good idea, it was a lossless format but is now extinct. I am looking for a reputable converter from .shn format to any other newer format, preferably .flac. I have both Mac and Windows operating systems. Hope someone can help out.
The Wikipedia page has examples of using ffmpeg to convert the fies to FLAC: https://en.wikipedia.org/wiki/Shorten_(file_format)
On a Mac I’d say give XLD a try. I have been using this app widely for format conversions and basic tagging. On the referred website it says that it does recognize shorten files, but only shorten V3.
A bit late to the convo but I’d also recommend xACT for Mac. It handles a lot of transcoding and verification tasks and can easily transcode from SHN to FLAC (I do it all the time for those same old live bootlegs as I’m adding them to Roon ).