Hello, thanks my friend. After I renamed the videos as per your advice, they all work. Great, cool, very good resolution. I use the shareware IamToo PSP Converter, is the recommended Image Converter from SONY a better product? But IC is more expensive. IamToo costs US$19 only. Last but not least, I have enabled WMA playing, but still the PSP cannot read the .WMA clips in the same folder. Any idea? Thanks!