We should return 'true' even if resulting path is shorter than MAX_PATH, because we can also use this function to open files with non-standard charact

'Ext' is an extension with the leading dot, like L".rar".

Set all bits of the status byte

Pointer to emulator

fetches an APURAM pointer to the Instrument Panel's highlighted instrument, or NULL if the tracker isn't playing or the currently highlighted instrume

safe strncpy: copies maxlen-1 max and always returns zero terminated dest

If the message is a note on, note off, or poly aftertouch message, GetNote() returns the note number

If the message is some sort of meta-message, then GetMetaType returns the type byte.

Access to the raw byte1 of the message

If the message is a channel message, this method returns the MIDI channel that the message is on.