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Firefox does not open Filetypes from Windows File Handler

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I can't open Files from Firefox on a Windows Terminal Server. Whenever I try to open a downloaded file by clicking on it (or specifying "open with" on the download Dialog) nothing gets opened and no errors are shown.

Usually it opens the default program specified in Windows but on 2 Terminal Servers nothing opens.

What I tried so far:

  • Check filetype associations in Windows and testet it on a cmd and the windows explorer: works as expected
  • Try with different Windows Users: Problem is present across different windows users
  • Try with a new firefox profile: Same problem
  • Try with firefox.exe -safe-mode: Same problem
  • Try resetting handlers.json (by moving from the Firefox installation directory)

Do you have any ideas how to investigate this further?

I know that it worked previously. Could this be caused by a Update of Firefox?

I can't open Files from Firefox on a Windows Terminal Server. Whenever I try to open a downloaded file by clicking on it (or specifying "open with" on the download Dialog) nothing gets opened and no errors are shown. Usually it opens the default program specified in Windows but on 2 Terminal Servers nothing opens. What I tried so far: * Check filetype associations in Windows and testet it on a cmd and the windows explorer: works as expected * Try with different Windows Users: Problem is present across different windows users * Try with a new firefox profile: Same problem * Try with firefox.exe -safe-mode: Same problem * Try resetting handlers.json (by moving from the Firefox installation directory) Do you have any ideas how to investigate this further? I know that it worked previously. Could this be caused by a Update of Firefox?
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額外的系統細節

已安裝的外掛程式

None

應用程式

  • User Agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/78.0.3904.108 Safari/537.36

更多資訊

crankygoat
  • Top 25 Contributor
30 個解決方法 338 個答案

You may want to check your Event Logs or trace what happens with Sysinternals Process Monitor. Maybe a file (not user) permissions problem?

You may want to check your Event Logs or trace what happens with Sysinternals Process Monitor. Maybe a file (not user) permissions problem?
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提出問題者

I procmon I can see that it searches for the program in the registry and finally tries to open AcroRD32.exe with the appropriate path of that executable. After that there's a QueryOpen Operation with the path of the PDF File (but nothing further after that). I copied the path of the executable and the PDF File in a cmd within the session and it opens just fine. Only within Firefox there's no Window appearing. This tells me that permissions are fine (Acrobat Reader can be opened and the file too). Nothing relevant shows up in the Windows eventlogs though (so no appcrashes or similar stuff)

I procmon I can see that it searches for the program in the registry and finally tries to open AcroRD32.exe with the appropriate path of that executable. After that there's a QueryOpen Operation with the path of the PDF File (but nothing further after that). I copied the path of the executable and the PDF File in a cmd within the session and it opens just fine. Only within Firefox there's no Window appearing. This tells me that permissions are fine (Acrobat Reader can be opened and the file too). Nothing relevant shows up in the Windows eventlogs though (so no appcrashes or similar stuff)
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