Enable only a few file types
If you want to enable only a few file types and leave the rest up to the system or other already installed thumbnail providers, use this technique.
4.Choose a file format you want to enable using the File Format combo box.
6.Optionally repeat steps 3 to 5 for other file formats you want enabled.
7.Press the Apply button to apply the changes to the system.
8.Optionally Clear the Thumbnail Cache in order to reflect these changes fully to the system.
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