Large file moving back and forth around drive

I have a 300GB drive with ~ 20GB of normal files and a single Truecrypt 50GB archive file. Although that file SHOULDN'T be getting larger or smaller, each time I run Defraggler it will think that file is fragmented and move it all around the drive. Even if I chose to move it to the end of the drive, when I defrag the drive, it will move that file closer to the beginning of the drive, then back to the end.

Any suggestions, or is this a limitation of Defraggler?

2.02.253

What OS are you running??

Richard S.

Windows XP SP3

(old faithful!)