A genuine Fix-It Felix Jr. MAME ROM does not exist in the traditional sense. Instead, seek out the numerous free, legal fan-made clones that run directly on Windows or in a browser. If you’re interested in MAME for other classic arcade titles, learn to dump your own ROMs or only download those verified as freely distributable. Respecting copyright ensures the hobby remains sustainable.

The short answer is that there is no official MAME ROM for Fix-It Felix Jr

If you specifically need a ROM for an emulator, you must use unofficial homebrew versions:

Launch MAME, select Available , type fixit . If the game doesn’t appear, press to refresh your ROM list. Double-click to play.