To create the dummy file there are a lot of programs in websites like
www.dcemulation.com
Just remember this formula to calculate the size in MB
= (capacity of cdr) - (first session) - (program data session)
remember that 1 sec audio is equal to aprox. 8,75MB for the firt session
the name should be 0000.dat or 000.000 or 000dummy.000, you get the idea (make it the first file of the whole dir, and place it in the root dir)
I know there is at least another way to fix the file system (I don't know if it involves the addition of dummy files); but I don't know much about it, so maybe someone else can explain this.