As we know files on FAT32 file systems can't go beyond 4GB in size. This will, for example, cause Virtual PC to split a virtual hard disk in more files when the 4GB size limit is reached. Unfortunately Virtual Server 2005 does not support accessing split virtual disk images. To "unsplit" a splitted VPC virtual hard disk what you can do is to edit the virtual hard disk by shrinking it on a file system that supports going beyond the 4GB limit (e.g. NTFS). This operation will create a copy of the virtual hard disk but this time it will be made up of a single file.