With the dat file, tools like or ROMVault can verify and rebuild your collection from multiple sources.
Q: What is a ROM set? A: A ROM set is a collection of ROMs that are required to play a specific set of games on an emulator. mame 078 rom set download link
If you want to clean up your list or remove "adult" games, use a tool like Clrmamepro with a MAME 0.78 DAT file to verify your collection. With the dat file, tools like or ROMVault