[Large (8Gb) file not being de-fragmented]

Don't believe I've got any non-default options enabled.  Have tried the individual file defrag on it and it comes back with a box saying "Defrag Aborted. No files were defragmented. This operation cannot be done.", which suggests for some reason there is a file it cannot defrag.  I even copied the file and deleted the old one and it still has exactly the same issue.  Any ideas?

[Large (8Gb) file not being de-fragmented]

Hi, I have a large movie file transferred from my Sony DAT camcorder, which is a .dvr-ms file and is 8.8GB.  Every time I run defraggler it ignores this file and doesn't fragment it.  Is this a size restriction or file type restriction that I'm not aware of?