My current Unknown modules folder consists at the moment of 810 modules (all formats).. This folder literally contains everything that I haven't been able to identify yet.. Every now and again I try to identify them through AMP, Modland, Demozoo and Kestra... It's almost impossible to identify some, especially those that might be a few bytes different etc etc.
Remember this
https://amp.dascene.net/forum/index.php/topic,779.0.html ? (cooperation was one of those mods)....
Typically, when I add new entries, ie. like when AMP has added many new mods lately, I use the Find Files/Duplicates in TC, and occasionally it turns up some of the unknown modules, but rarely. Also, when I add or rip modules (back in the day), I tended to keep the date-stamp intact and cooperation was added back in 2000, where it's been sitting since I added it. I think the jungle module was added recently and I recognised the tune and managed to find it, nothing will find cooperation when there is a 14 byte file-size difference with the jungle mod.
Another trouble with my unknown ones, not everything as released in a demoscene production, si I have no idea where they come from..
** edit **
My unknown pt (not all amiga pt) modules sits at a modest 256 (just under 40mb)....., so not as bad I as thought. I have been rummaging through as I got nothing else to do atm. Came across a mod saying it was ripped from Worldness VI, Kestra seems to have them all from the production I presume. I can't get the .dms to work, so I can't check it. Funny, the mod is called Spring, WN VI has a intro on there called Spring/Gemini, so who knows.....