Memory access violation

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PowerPC603

I created a simple movieplayer, which must be loaded when I double-click an AVI-file.
I changed the filetype in Windows for setting my movieplayer to run when an AVI is opened.
When doubled-clicking this file: "c:\TestMovie.avi",
Windows runs my movieplayer, but I get the error-message "Memory Acces Violation".

This is the code used for opening the file:

file$=CommandLine()
movie=OpenMovie(file$)

When I change the code to this:

movie=OpenMovie("C:\TestMovie.avi")

then it works perfectly.
I printed the commandline onscreen, using:

text 0, 0, file$

and then it said: "C:\TestMovie.avi"
So I don't see any problem why the upper approach doesn't work.

Can anyone help me with this?