A DAT file is a text blueprint listing every correct file name, size, and checksum for version 0.78.
All of these run perfectly in MAME 0.78. mame 078 game list link
The clone and the parent are combined into one single zip file. This saves maximum space but can make sorting menus confusing. Where to Safely Download the MAME 0.78 Romset A DAT file is a text blueprint listing
What are you using? (Raspberry Pi, PC, handheld, Android?) mame 078 game list link