Recently when browsing a Compressed (zipped) Folder containing some JPG images, I observed that the preview pane displayed the message "No Preview Available" when selecting an image file. However, preview worked fine if the files were extracted to a folder and then viewed from there.
That doesn’t mean the preview handlers don’t work in Compressed (Zipped) Folder view. When in a Compressed (Zipped) Folder view, the shell queries the preview handler registered at the file extension level, or at the ProgID level only. But for certain file types, Windows Vista and Windows 7 by default registers the preview handler based on the Category (or Perceived Type basis.)
For example, for image files such as JPG, GIF, PNG etc, the image preview handler ("Photo Extract Image" GUID {3F30C968-480A-4C6C-862D-EFC0897BB84B}) is registered at the following registry location:
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Recently when browsing a Compressed (zipped) Folder containing some JPG images, I observed that the preview pane displayed the message "No Preview Available" when selecting an image file. However, preview worked fine if the files were extracted to a folder and then viewed from there.
Fig 1: Compressed (Zipped) Folder View
I extracted the images to a folder, and preview works just fine.
Fig 2: Windows Explorer Folder View
That doesn’t mean the preview handlers don’t work in Compressed (Zipped) Folder view. When in a Compressed (Zipped) Folder view, the shell queries the preview handler registered at the file extension level, or at the ProgID level only. But for certain file types, Windows Vista and Windows 7 by default registers the preview handler based on the Category (or Perceived Type basis.)
For example, for image files such as JPG, GIF, PNG etc, the image preview handler ("Photo Extract Image" GUID {3F30C968-480A-4C6C-862D-EFC0897BB84B}) is registered at the following registry location:
HKEY_CLASSES_ROOT \ SystemFileAssociations \ image \ shellex \ {BB2E617C-0920-11d1-9A0B-00C04FC2D6C1}
Windows Explorer, when you’re in a Compressed Folder view, doesn’t look at the above location and would simply say "No preview available". This is a simple bug in Windows 7/Vista that needs a fix.
Whereas Windows Explorer (when you’re not browsing a Zip folder) uses the preview handlers that are registered at the following areas:
1. File Extension
2. ProgID
3. Type (PerceivedType)
Hope this note helps some readers!
Whereas Windows Explorer (when you’re not browsing a Zip folder) uses the preview handlers that are registered at the following areas:
1. File Extension
2. ProgID
3. Type (PerceivedType)
Hope this note helps some readers!
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