Hi & Welcome to VBAX!

A hmm from me as well!

Is this part of a VB project? (Because you're using the common dialog and some new file extensions I don't know off)

Try to release the object reference on the end of execution. A known error causer..

So before the Exit sub (twice the way this code is written) put:[VBA]
Set cdlFileOpen = Nothing[/VBA]

Later..