I found this mod to make 1nsane widescreen.

http://community.pcgamingwiki.com/files/file/27-1nsane-widescreen-mod/

Does it work? Can you post a screen shot? I want to make sure it works before I buy the game.

As always, put it through a virus scan before running.

Was I just playing in stretched 4:3? Couldn't tell, looked widescreen to me.

EDIT: Oops, no. GOG version comes with widescreen support already. So yeah, that's why it didn't look stretched.