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Thread: [Irfanview Thumbnails] /thumbs: Can't read file header. Unknown file format, empty

  1. #1
    IV Amateur
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    Default [Irfanview Thumbnails] /thumbs: Can't read file header. Unknown file format, empty

    Using IrfanView 4.51 x64 in win10 v1803.

    Whenever I rightclick in File Explorer on any folder, and press "Browse with IrfanView" even on c:\1, an empty folder , I get the following error popup (also see attached screenshot):

    Code:
    C:\1 /thumbs: Can't read file header ! 
    Unknown file format, empty/damaged file or file not found !
    If I press OK at the popup, then Irfanview Thumbnails starts ok.

    I don't have any problem when opening files directly in IrfanView, by doubleclicking them in File Explorer


    Click image for larger version. 

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    Last edited by zakk; 12.05.2018 at 10:17 AM.

  2. #2
    Moderator Enterprise User Bhikkhu Pesala's Avatar
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    I just get the context menu. Do you see something like that?

    Click image for larger version. 

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    What do you have enabled in Shell Options?

    Click image for larger version. 

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  3. #3
    IV Amateur
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    Default

    Sorry, I missed:
    "Whenever I rightclick in File Explorer on any folder, and press "Browse with IrfanView" .

    Here are the two screenshots:
    Click image for larger version. 

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ID:	5250 Click image for larger version. 

Name:	2018-05-12_130244.jpg 
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ID:	5251

  4. #4
    Moderator Enterprise User Bhikkhu Pesala's Avatar
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    Default

    Confirmed. I sent a report to Irfan Skiljan.

  5. #5
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    Thank you for the quick response!

  6. #6
    Moderator Enterprise User Bhikkhu Pesala's Avatar
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    I fixed it after getting a hint from Irfan Skiljan. Try this (I did the reverse to use 32-bit version, which is better as it supports all plugins).

    1. Run C:\Program Files (x86)\IrfanView\i_view32.exe as Administrator
    2. Disable the "Add Browse with IrfanView" for drives and folders in shell menu
    3. Run C:\Program Files\IrfanView\i_view64.exe as Administrator
    4. Enable the "Add Browse with IrfanView" for drives and folders in shell menu

  7. #7
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    I only have the 64-bit version installed, so by running i_view64.exe as admin and disabling and re-enabling "Add Browse with IrfanView" the issue is fixed for me too.
    Thank you.

  8. #8
    Moderator Enterprise User Bhikkhu Pesala's Avatar
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    Glad to hear that it is fixed for you now.

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