The folders contained in this package contain:

DAT_ClrMAME      : "MAME 0.37b2.dat" file dats based on XML with the format of ClrMAME.
DAT_ClrMAME (old): "MAME 0.37b2.dat" file dats based on XML with the format compatible with older versions of ClrMAME.
DAT_ROMCenter    : "MAME 0.37b2.dat" file dats based on XML with the format of ROM Center.

DOCs: The original readme.txt and whatsnew.txt file (only for the stable version) and the list of all the emulated games.

XML: File dat based on an old romset and on the information contained in the original MAME package (edited manually).

I added some fields not present in the original MAME xml:

<added_by>   : The original author of the MAME driver.
<added_in>   : From which version a game is present.
<progversion>: Progressive "real" number of each published MAME.
name="mameID": Unique progressive number of each machine added to the MAME.