File handling
 

I have a spreadsheet written in Excel 2003 that creates files and adds a
custom file extension e.g. .prc to files and assigns this to a variable to
save a file e.g. Just.prc with activeworkbook.save as filename=variable_name.
I am being prompted with a SAVE AS dialog sheet and Excel tries to save the
file in xlsx format. This did not happen previously. Please help.