Hmm I guess this isn't a "computer issue" but still it is a good question ;)
Some time ago I found a file on my computer that was 0 bytes, which isn't that strange I guess. I was however a bit surprised since I had absolutely no idea where the file had come from. So I checked the filetype, of the file, and it was a L!C-file. So my question is, what is a L!C-file?