Thumbnail Views Not Displayed for Some File Types

When you enable Thumbnail view for your folders and configure Windows Explorer or My Computer to be viewed as a Web page, the Thumbnail images for some file types may not be displayed. This behavior can occur if you remove and re-create the file association for a file type (when you install another application that registeres that file type). The registry entry used by the Windows Desktop Update component to display Thumbnail images is not updated properly when you re-create the file association (thus, if you uninstall an application which took over a files association, it will not be restored).

To fix this:

Click Start > Run, and type the following command in the Open box:

regsvr32.exe /i shdocvw.dll - If you have Internet Explorer 4 installed

regsvr32.exe /i shdoc401.dll - If you have Internet Explorer 5 installed

(and press Enter).

Some more information for those who lost the ability to preview certain file types:

For this to work, the folder where you want to preview the images has to have View as Web page enabled
There's the folowing registry fix:
Verify that the following entries exist in the HKEY_CLASSES_ROOT\ registry key for the type of file you are trying to preview:
- Registry Key: HKEY_CLASSES_ROOT\ShellEx
- Registry Key: HKEY_CLASSES_ROOT \ ShellEx \ {BB2E617C-0920-11d1-9A0B-00C04FC2D6C1}
- Value: (Default)="{7376D660-C583-11d0-A3A5-00C04FD706EC}"
The following file types use the registry values listed above:
- .art
- .bmp
- .dib
- .gif
- .jfif
- .jpe
- .jpeg
- .jpg
- .png
- .wmf

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Thumbnail Views Not Displayed for Some File Types