Keep forgetting to post this.
If anyone is having issues with TOSEC file folders or DATs within very long paths (I assume others are having this issue, even if you have not noticed it!) then Roman has done a hotfix in CMP.
Updated EXE posted in the CMP forum below:
https://www.emulab.it/forum/index.php?topic=4588.0Its not in the official release yet.
You will have this issue too if you store DATs/files using the move/create scripts, e.g the example I gave Roman of: "C:\Program Files\ClrMamePro\datfiles\TOSEC-PIX\Tandy Radio Shack\Magazines\Byte Bandits of America Tandy TRS-80's Computer Club Newsletter\Tandy Radio Shack - Magazines - Byte Bandits of America Tandy TRS-80's Computer Club Newsletter (TOSEC-v2010-01-21_CM)".
Think there around 10 DATs that where an issue.