Windows 10: Need Advanced Answer: File Explorer.exe Thumbnails

Discus and support Need Advanced Answer: File Explorer.exe Thumbnails in Windows 10 Customization to solve the problem; Hi, I was unable to find any documentation that answers this question: What/how does Explorer.exe decide which application renders a thumbnail?... Discussion in 'Windows 10 Customization' started by GeraldSchwab, Oct 29, 2020.

  1. Need Advanced Answer: File Explorer.exe Thumbnails


    Hi,


    I was unable to find any documentation that answers this question:


    What/how does Explorer.exe decide which application renders a thumbnail?


    I've seen lots of replies on this forum that say "Set the default program" or setting the default program controls what renders the image as a thumbnail but this is not true.


    I have a thumbnail viewer pretty awesome btw called ImageGlass - way better than default one that comes with Windows10 and ImageGlass is set to the default program to view all my images....


    But only certain image types have a preview thumbnail, for example:


    .png has a thumb

    .jpg has a thumb

    .gif has no thumb


    but ImageGlass is the default application that opens all 3x formats.


    So what I'm looking for is, what registry keys, or what settings define which DLL, or EXE is used to render thumbnails? Does the program have to respond to certain OLE apis or respect certain flags/switches when the thumb is passed from explorer.exe to said application?


    Or can anyone point me to documentation that explains in detail, how the thumbnail rendering happens?


    I feel like there should be more stuff available than "set the default program".

    :)
     
    GeraldSchwab, Oct 29, 2020
    #1
  2. Dgo47 Win User

    File Explorer not showing thumbnails

    Brink,

    Many thanks for you reply. I have done all the steps you suggested, but no change,

    When I open a folder containing photos, some open correctly but the vast majority open with thumbnails, but they very quickly get overwritten and you can not longer see the thumbnails.

    Are there any more suggestions?
     
    Dgo47, Oct 29, 2020
    #2
  3. jsmin Win User
    Windows Explorer crashes and thumbnails problem

    Hi, I hope you can help me.
    Windows Explorer is no longer showing thumbnails on files played by Windows Media Player. I've run cmd and regsvr32 shmedia.dll and regsvr32 shimgvw.dll. That seemed to solve the problem...but it created a different one. Now when I try to open a folder on an external hard drive it crashes. I read in an old 2008 post it was an avi file causing the problem and suggested the run cmd regsvr32 /u shmedia.dll. That solved the opening problem but recreated the thumbnail problem. Any help to achieve both functions would be greatly appreciated. Thank you.
     
    jsmin, Oct 29, 2020
    #3
  4. Paolo Mag Win User

    Need Advanced Answer: File Explorer.exe Thumbnails

    "This file can't be previewed" problem in explorer

    Hi Deborah,

    For us to provide an accurate resolution, kindly elaborate the issue by answering the questions listed below:

    • Since when have you been experiencing this issue?
    • Were there any changes on your PC before this happened like software or updates installed?

    For initial troubleshooting, we suggest that you follow the steps listed below:

    • Open File Explorer.
    • Access this link

      C:\Users\USERNAME\AppData\Local\Microsoft\Windows\Explorer
    • Delete all the files.
    • After deleting the files kindly try and see if there's a thumbnail preview of your files.

    We're looking forward to your response.
     
    Paolo Mag, Oct 29, 2020
    #4
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Need Advanced Answer: File Explorer.exe Thumbnails

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