I just wanted to report that several files from today's release of ini files (especially those from the PS_category_230 archive are corrupt.
They contain a little garbage just before the first "[", so mameui doesn't recognize them, saying it can't parse them because [root_folder] is missing.
The only workaround I could find is to copy the whole content of the files to a new file, that gets rid of the garbage.
The garbage is not visible under windows, but it can be seen using a DOS editor or the "list" command in TCC or tcmd or 4DOS/4NT.
edit: You can also see the garbage using an hex editor in windows. the garbage is composed of three chars: EF BB BF
Hope you guys can upload clean files ASAP.
PS: Turns out that EF BB BF is the "BOM" , Byte Order Mark, used in UTF-8 encoding. for some reason, some files have this mark and some don't. But, whatever the case, MAMEUI doesn't recognize ini files starting with those 3 bytes.