PC versionGBAWIP Fans have made a PC version. Some are still early, so read the project page first.
Fans took Castlevania: Harmony of Dissonance apart and rebuilt it so it runs natively on a computer, often with widescreen, higher frame rates and mods. Here is the project we know about:
Static recompilation of Castlevania: Harmony of Dissonance (GBA) to native PC, powered by gbarecomp. Work in progress — no ROMs or copyrighted assets included.