Happy to hear from you Davor that you think there is a way to do it - so worthwhile to keep trying I guess. No joy when I clicked on the folder, held and clicked on control, as you suggest. When I did this to the copy of the .ia file I got the usual menu with the options to "open" and "open with" - but when I chose Sinar eXposure as either of these options the program did open but the copy of the .ia file did not, nor did the file appear in the folder in browser of the eXposure program.
I normally shoot to internal storage first and move to CF cards before it gets full, during breaks in shooting. The back continues to shoot as it is moving images to the CF card. The literature says that max 8GB cards are supported but I have used 16GB and 32GB without problems. So my solution is to buy a higher capacity CF card or two, I think you can get 64GB today which might cover your need.