These seem to all work!
fscommand ("exec", "notepad"+chr(9)+"scrolltext.txt"

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Will open scrolltext.txt in the same folder as the projector, with notepad (skip the .exe), if notepad is in the c:/windows folder.
fscommand ("exec", "d:/carmen/fish"

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Will open fish.exe (another projector .swf).
fscommand ("exec", "D:/Flash/Flashtextfiles/notepad"

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Will open a copy of notepad.exe in D:/Flash/Flashtextfiles.
fscommand ("exec", "write"+chr(9)+"d:/carmen/CvF.rtf"

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Will open CvF.rtf, with write.exe also situated in the c:/windows folder.
fscommand ("exec", "D:/Flash/Flashtextfiles/notepad"+chr(9)+"D:/Flash/Flashtextfiles/scrolltext.txt"

;
Will open...
A problem both in the acrobat reader and word, prevent me from trying it out, but they should work in a similar manner, at least on a PC.
If the above don't work, you can allways try the following would should work but first opens an annoying dos windows (for a few seconds!), before opening the application:
fscommand ("exec", "start"+chr(9)+"scrolltext.txt"

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Will open scrolltext.txt in it's default program.
Regards,