I have almost completely reverse engineered Cartooners' (year 1988/1989, developer: IDTA, publisher: Electronic Arts, MS-DOS version) actor file (*.act) format and made a program that import and export actor templates. It can be downloaded at: VBForums post
Right now I have also made a start at analysing Cartooners' music (*.mus) files. Unfortunately I know very little about MIDI music and the specifics of how soundcards work. Although there is a lot of information in this regard on the internet, I could still use any help offered. A document describing what I already know about the *.mus file format can be downloaded at: .mus (music) file format information.
Alright, I just made some progress. It appears that the last byte in a .mus file controls whether or not the music is restarted after the last note has been played. (0x80 = Restart the music. 0x81 = Stop playing the music.)
In an attempt to organize all the information I found and added myself, I made a minimal website which can be found at: http://www.euronet.nl/users/swinkels
Alright, I moved the Cartooners *.mus (music) format information to a wiki: Electronic Arts MUS. Since I've little experience with wiki's it's a bit sloppy. I'll likely try to clean it up a little later.