Associate ROM files with SameBoy on Windows about sameboy

[LIJI32]

I'll give it a look, if I get it working I'll also add the cartridge icons in Windows .ico format.
(SameBoy internally wraps fopen and co. to use UTF-8 strings for source compatibility with every other OS)

[LIJI32]

More thoughts:

1. Is there a way to do this less aggressively? i.e. don't overwrite existing associations.
2. How would I associate a specific icon resource with these types?
3. Can I add myself as a "valid open handler" for a file without "stealing" the default handler for a file type?

[Rangi42]

1. Check if "Software\\Classes\\.gbc" already exists with RegOpenKeyEx, and if so, ask the user whether to continue?
2. Create HKCR\SameBoy\DefaultIcon and set it to the .ico path. (Or to use e.g. icon -42 within an EXE or DLL, you can do sameboy.exe,-42.)
3. Add sameboy.exe to HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\FileExts\.gbc\OpenWithList.