View flv 3gp and other videos thumbnails in windows7
Many videos format such as .flv,.3gp .mp4 and .vob are not shown in thumbnails.There's an easy ways to show them.
First Download This
Download K-Lite Codec
If you have a 64-bit version of Windows Install this one too.
K-Lite Codec x64
The thumbnail options are available in the 64-bit codec pack. That is because Explorer is a 64-bit application. We recommend that you install both the 32-bit and the 64-bit codec pack on 64-bit version of Windows.