About This File
The standard issue of the Atari 7800 software system artwork file, a7800.zip limits all games to a common, generic bezel. That's how MAME does software system external artwork by default.
This is essentially an expanded version of a7800.zip, that will allow each game (it caters for the games associated with the Bezel Project Atari 7800 pack) to display it's own bezel at launch.
Note that this is for MAME standalone only and is not compatible with RetroArch.
Once downloaded, the file MAME Atari 7800.zip should be unzipped.
The artwork file in the download is a7800.zip and it contains the multi-view lay file.
The game bezels themselves are not included, due to permission from the Bezel Project to distribute them not sought, so you will need to download the pack and drop the bezels into the artwork a7800.zip yourself.
You will also need to set LaunchBox Custom Command-line Parameters to allow MAME to match the correct bezel for each game. This is explained in the download.
The a7800.zip artwork file will work whether you are emulating using direct media calls (games with the long naming and a78 or bin extension) or emulating using a software list.
