GPx Lapcharter...some help please?

This question is directed towards Haiko Benthem, or anyone else who may have downloaded and used the program.

I recently downloaded the GPx Lap charter for GP3, followed the directions to find Rene Smit's HOFxLap program, then it asks for Input/Output folders (which contain a whole list of non-championship saved gaves), then when I click on the button marked "Load files from input dir", the program isn't detecting them!

It doesn't specify the file types, or anything like that. I have no idea which files it's supposed to be looking for!

Is it supposed to be looking for files with a *.ra* extension (non-championship races), or *.ch* extension (championship races), or even a *.qr* extension (quickrace), because I have no idea, and I'd really like to use the program.