Ah. Didn't know it was gzipped. Looking at the file I had no easy way of knowing it was gzipped using Windows. Seems easy enough to edit now I know it's an archive.
Doom 64 (U) (V1.1) is not recognised by the current ini, so open it with WinRAR, extract, open with Word Pad. Add the following:
[1B1378BB9EE819F740550F566745AF73]
Good Name=Doom 64 (U) (V1.1) [!]
Header Code=423E96F4-CE88F05B-C45
Save, add to a gzip archive with 7zip or other, rename extension to ini. Someone else can do the honours for other games.