MAME reads BIOS and game files directly from ZIP archives. Extracting them into separate folders will cause MAME to ignore them.
If you have a ROM set labeled "MAME 0.148" or "0.148l," you cannot simply drop in a BIOS pack from MAME 0.200 or 0.250. The versioning must match perfectly. Mame Bios Pack 0.148l
If you answered "Yes" to all three, the MAME Bios Pack 0.148l is the missing key to your arcade preservation project. MAME reads BIOS and game files directly from ZIP archives
Given that MAME is now well past version 0.260, why would anyone specifically seek out the ? Mame Bios Pack 0.148l