NTuser cd video.I have come across this in my D file and do not know what it is. I try to delete it i receive the message It is in use by someone else( ? ) or another programme. What is it and how do i delete it? Also I cannot find theD Application File in the All Users file that has a Kaspersky programme still in that I deleted ages ago. Help? :-)

Do not delete it. Ntuser is part of your profile. It shows as a video file but it is really ntuser.dat and cannot be deleted while you are logged on. It is a required file and should not be deleted.

It would appear that at some time you've watched a VCD (Video CD) in Media Player, and associated the .dat file extension with that program. VCD's use the .dat extension on mpeg1 encoded video files. The same extension is used for data files that are NOT video files. You should change the file association to "none". A tip for future use: When you wish to view video on a VCD, copy the .dat file(s) to your hard drive, then change the file extension to .mpg. The video will then play in Media Player by double-clicking. The same applies to .vob files on a DVD. Please let us know if you found someone's advice to be helpful.