RAR file + Emulator = ???

I can't figure out how to use one of my ROMs in my Visual Boy Advance emulator, mainly because it's a RAR file. Are there any special setting I need to use, or should I just look for a different type of file altogether?

Use winrar to extract the files.

In case you don't know how.https://www.romulation.org/forum/index.php?topic=3880.0

You can use what g@l1h have suggested or use 7-zip.
Extract it to a folder, and run the .exe file to use it.