Partial solution Found!

Issuing a CLOSE ALL, closes any files opened with a Low Level File Function, thereby releasing the system file handle(s). Putting CLOSE ALL in my FOR..ENDFOR loop seems to cure the problem.

But this is rather a heavy handed way of doing things. Let's say for example that I have tables or other files open that I want to use. If I could determine the file handle number associated with the Folder3 file name, then I could issue a FCLOSE(lnFileHandleNum); a much more elegant solution.

Do you know how I can retrieve the file handle number of a specific open file?

Thanks
Don Lowrey