File associations

[jpcima]

Allow the software to be associated with some file extensions in the operating system's file explorer.
Maybe, add a settings panel to control the list of associated file extensions.

Example:

[Wohlstand]

The full list of supported formats and their identifiers:

• WOPL - Magic WOPL3-BANK\0, extension .wopl
• OPLI - Magic WOPL3-INST\0, extension opli
• SBI - Magic SBI\x1A, extension sbi
• IBK - Magic IBK\x1A, extension ibk
• UNIX SB (2op) - Magic 2OP\x1A, extension sb (also may be \0\0\0\0 magic for some cases, then rely on extension)
• UNIX SB (4op) - Magic 4OP\x1A, extension o3 (also may be \0\0\0\0 magic for some cases, then rely on extension)
• Junglevision bank - Magic Junglevision Patch File\x1A\0\0\0\0\0\0\0\0, extension op3
• FlatBuffer OPL-3 bank - Magic FOP3 at 4-7th byte, extension fbop3
  (Identifiers must always be exactly 4 characters long. These 4 characters will end up as bytes at offsets 4-7 (inclusive) in the buffer.)
• DMX OPL2 - Magic #OPL_II#, extensions: op2, htc, hxn
• Bisquit's bank, magic NONE, extension adlraw
• Apogee TMB, Magic NONE, extension tmb, fixed file size 256*13
• AIL "Global Timbre Library", Magic NONE, extensions: ad, opl
• Legacy AdLib Banks: Magic NONE, extensions tim, snd
• AdLib BNK: Magic at 2'nd byte ADLIB- OR: \1\0ADLIB- and \0\0ADLIB-, extension bnk
• AdLib INS: Magic NONE, extension ins, fixed file size 80 or 54 bytes

[jpcima]

I have collected some info on how to create file associations by OS:

• Windows: by entries in HKEY_CLASSES_ROOT. These can be added dynamically or by installer. (for us, we don't have an installer)
  https://msdn.microsoft.com/en-us/library/windows/desktop/hh127451(v=vs.85).aspx

• Linux: it's a 2 step process. first, create a MIME database entry for the files formats, which is matched to either file extensions or magics. (application/x-something) second, declare the list of MIME types supported in the desktop file.
  https://www.freedesktop.org/wiki/Specifications/AddingMIMETutor/
  https://specifications.freedesktop.org/desktop-entry-spec/latest/ar01s10.html

• OSX: define CFBundleDocumentTypes in a bundle plist. It's also static only. https://developer.apple.com/library/archive/documentation/General/Reference/InfoPlistKeyReference/Articles/CoreFoundationKeys.html

So, only Windows will make use of such a thing as a setting dialog.
And unless there can be an install procedure, the associated has to be created in such way.