Be cautious of search results pointing to Google Drive or suspicious .exe files labeled as "Ps63b.1a Download [PORTABLE]". These are often malware. A legitimate ps63b.1a is a tiny data file, not an executable program.
Check which version of MAME or FinalBurn Neo you are using. ROMs are version-specific; a ROM set for MAME 0.139 may not work on MAME 0.265 . Ps63b.1a Download
Rather than searching for the individual ps63b.1a download, it is safer and more reliable to find a verified punisher.zip that is compatible with your emulator version. Sites like Emurom.net or MDK.cab list the specific contents of compatible ZIP files. Be cautious of search results pointing to Google