Thanks for the headup regarding the extension.....guess it simply cuts everything after a "."
Of course it's hard to say what an extension is....for windows I guess you can assume one to maximum 4 characters...
but even that limit would crash "PC Engine Fan - Special CD-ROM^2 Vol. 1"
ok...you would say if there is a space after the ., ignore it, too....I will check if I can make it a bit more clever...but I guess there will be always some names which will fail.
Regarding newer guides about all the internal/hidden stuff....unfortunately not...usually I mention them in the history (https://mamedev.emulab.it/clrmamepro/#history) part when something useful is added or changed.
Yes I was thinking about this, perhaps something to tell the program to look at the name of a game, and if it contains "." or more than one "." then only remove everything after the last dot. As for a guide I was just curious about the settings because I'm a power user when it comes to things, and I see a lot going on in the cmpro.ini that isn't evident in the UI

Thanks for the update I'll check it out in a little while.