Use a DAT file from the MAME 2003-Plus GitHub page to verify your files if you encounter "Missing Files" errors.
Every single zip file is a complete, standalone package. mame 2003plus reference full nonmerged romsets link
Because of the legal nature of ROM files, they are not hosted on official GitHub repositories or documentation pages. However, the community maintains "Reference Sets" on archival sites. To find the most reliable links, you should search for: Use a DAT file from the MAME 2003-Plus
Users often share updated links to verified "DAT" files, which you can use with tools like ClrMamePro to build your own set. How to Use the Romset mame 2003plus reference full nonmerged romsets link
