Invalid Image File

When I try to add my Image in WDS I get the following message: The file does
not contain a valid install image.

Here is what I have done so far. I have a syspreped Win XP machine that has
the system on the C:\ drive and the Documents and Settings folder on the D:\
drive. For testing purposes I first attempted this by only capturing the C:\
drive using Imagex. I copied it to my WDS server and was able to add it to
the Install images with no problems. I even PXE booted the machine, formatted
the C:\ drive and imaged it with that image, and it worked perfectly. Now I
needed to add the D:\ drive to my .wim image so I used imagex /append to add
the d:\ to my image. Then for testing purposes I used the Imagex /apply to
image the machine with both the C:\ and the D:\ drives, I also had no
problems with this, booted the machine and everything was perfect. I then
copied the wim image to my server and attempted to add the image to Install
Images and that is when I got the error. I have tried this multiple times and
no luck.

Any help would be great.