Sometimes, Windows 2000 and Windows XP will not display files in the Long File format i.e., A folder named Program Files may be listed as Program~.
This could happen if the registry value that determines whether NTFS generates a short file name in the 8.3 naming convention for each long file name is reset to “0″. It is possible that this value could have been changed – either manually or by a program. This setting is the default setting when you install the operating system. The registry value should be set to “1″ to stop NTFS creating the short file name.