[This file can not be imported. Make sure that it is a valid file type and that its contents have not been corrupted.]
Check if the bitmap file uses less than 256 color.
This problem occurs when you import bitmap file that uses less than 256 color (24 bit).
Convert the file to the one that uses more than 256 color with MS Paint etc., and then try again.
Q264599: Some Bitmap Formats Are Not Supported in Movie Maker