via http://www.aep-emu.de/

Cowering has a new Renamer for Sega Game Gear ROMs published.

Quote:
Notes for GoodGG V3.15

Been a while since last update (sigh). I have switched to
Win64, but compile with Win32 tools for you XP folks. Please
let me know if anything is broken as I cannot natively test
Win32 anymore. I am especially needing to know if zip/rar/7z
files that used to rename/decompress are no longer working.