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Gunnar-Haslinger's avatar
Gunnar-Haslinger
Iron Contributor
Jan 20, 2020
Solved

SmartScreen turned off -> Java Webstart JNLP Files are marked as "can harm your computer"

Edge v79 (stable) as well as Edge v80 (beta) mark a downloaded Java Webstart (JNLP) File as "can harm your computer" if SmartScreen is turned off. This is weird and seem to be a bug.   Here is a De...
  • Gunnar-Haslinger's avatar
    Gunnar-Haslinger
    Aug 12, 2020

    Starting with Edge v85 (currently in beta) there is a new policy "ExemptDomainFileTypePairsFromFileTypeDownloadWarnings" available which solves this issue:

     

    See Documentation:

    https://docs.microsoft.com/en-us/deployedge/microsoft-edge-policies#exemptdomainfiletypepairsfromfiletypedownloadwarnings

     

    I can confirm this works with
    Edge Beta 85.0.564.30
    Edge Dev 86.0.594.1

    BUT be aware: The text in the documentation is correct, but the given Samples in the documentation are currently wrong!

    Citing the Sample in the docs:

    SOFTWARE\Policies\Microsoft\Edge\ExemptDomainFileTypePairsFromFileTypeDownloadWarnings\1
    = {'domains': ['https://contoso.com', 'contoso2.com'], 'file_extension': 'jnlp'}

    The single quotes in the examples are wrong, only double quotes are accepted and work! So this should be corrected to:
    = {"domains": ["https://contoso.com", "contoso2.com"], "file_extension": "jnlp"}

     

    To check my JNLP JavaWebStart Sample-Link https://hitco.at/java-webstart-demo/ successfully working, use following registry-Keys:

     

    Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Edge\ExemptDomainFileTypePairsFromFileTypeDownloadWarnings]
"1"="{\"domains\": [\"https://*.hitco.at\", \"https://hitco.at\"], \"file_extension\": \"jnlp\"}"

     

Kelly_Y's avatar
Kelly_Y
Icon for Microsoft rankMicrosoft
Aug 12, 2020

Gunnar-Haslinger Thank you for finding the issue in the documentation!  We will be working on a fix to update the examples.  

    • PeDe's avatar
      PeDe
      Brass Contributor
      Jun 21, 2021

      Issue still exists in Version 91.0.864.41 (Official build) (64-bit) Workaround works for old Dell IDRACs but not for new DELL IDRAC 9

      Even with the Registry set:

      HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Edge\ExemptDomainFileTypePairsFromFileTypeDownloadWarnings
1 = {"domains": ["ourdomain.de"], "file_extension": "jnlp"}

      we also tried to exclude ".crdownload" because the downloaded temporary files were created in downloadfolder "Unconfirmed 339791.crdownload"

       

      Any Ideas?

      • Gunnar-Haslinger's avatar
        Gunnar-Haslinger
        Iron Contributor
        Jun 21, 2021

        PeDe I can confirm this Policy works as expected.

         

        See my tested / working example above this post.

         

        If your Registry-Export should show the contents of a .reg-File then there are Backslashes to escape all Quotation-Marks missing (see my sample). 

         

        you don't need to exclude ".crdownload", just "jnlp" without leading dot.

         

        Maybe you like to show us a screenshot of your edge://policy/ to check if the policy is really formatted correctly.

         

         

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