Re-run Per-User Setup from the Compaq Visual Fortran 6 program group. Without this, you'll find that a lot of Fortran debugging doesn't work.
There's no way we know of to change the order of file types in that dialog.
Per-user setup does the following:
1. Adds the paths to the various CVF BIN/LIB/INCLUDE folders to the "current user" registry keys used by Developer Studio for Tools..Options..Directories2. Replaces the registry value that the debugger uses to find the expression evaluator with a "switcher" that automatically selects Fortran vs. C. This solves the problem in this post.3. Adds a registry value that allows the profiler to work if the user installed Visual C++ Standard Edition
It does not touch your toolbars, layout, etc.