Oh, sry, just checked, and youre right, its the folder that is locked, not the file.
Im afraid I dont know exactly how ImgBurn is written, but it surely has to be some way to close the file and change the active dir (so the program returns to the state it was in before I opened any file)?(Or else just (automatically) open a dummy file and replace the file name with "Please select a file..." But that feels like too much of a hack for even myself to think its a good idea. )
@dontasciime: I think you got it exactly right, its just that I dont decide if I want to keep the image or not until after the burn.
(quoting myself)
Just reread cornholio7 answer and realized I had misunderstood, but in sort of a good way.
I thought he meant that if I click the browse button I ImgBurn I can delete both the file and the dir. And it _is_ possible to do it that way.