For the image format information, you can also refer to "Image File Formats" in CCBoot v3.0 Wiki.
First of all, it's available only if using Windows 7 or Windows 2008 as CCBoot server.
When uploading image from the client PC, please specify the "Image File Name" as "XP01.VHD" or other similar name with ".VHD" as its filename extension.
This ".VHD" format image can also support "Save to Image", recover image and "Merge Image". The only difference is after "Merge Image", it will not keep old image files.