Enable the checkbox for Thumbnails and press OK. Start -> All Programs -> Accessories -> System Tools -> Disk Cleanup That can usually be soved by clearing the thumbnail cache. Thumbnails are shown for new files, but not for old ones I am not getting thumbnails for AVI files on Windows XPĮxecute the following command to enable the Explorer shell extension that is responsible for thumbnail generation: 
Start the Windows Registry Editor program:. If you want to do it manually, then follow the instructions below. You can enable and disable thumbnails very easily with the Codec Tweak Tool. 
How do I disable thumbnail generation for a specific file extension? How do I completely disable thumbnail generation?
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