Based on your 1st post, I tested a similar export. I normally just export to the C1 default "output" folder, but created a named folder on a different drive. Had no problems, with any exports, with all the file types you listed.
Win 7 64 bit. C1 7.2.1
You might try a total uninstall-reinstall of the C1 on the machine with the problems. Note, check with Phase One as they have a process to fully remove a version of C1 from a win box. There are a few registry keys that won't come off with a control panel uninstall.
Paul