Could not load file or assembly Operation is not supported. (Exception from HRESULT: 0x80131515)


When I run CodedUI Test from a small Console tool via vstest.console.exe from a scheduled task I sometimes see this error message on different PCs:

error : Could not load file or assembly 'file:///C:\foobar.dll' or one of its dependencies. Operation is not supported. (Exception from HRESULT: 0x80131515)

Why/what is this not supported?

asked on Stack Overflow Dec 21, 2015 by magicandre1981

4 Answers


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Right click on the Dll and unblock it.

answered on Stack Overflow Jul 20, 2017 by Raj • edited Jul 20, 2017 by iehrlich

During my research I found that this may happen when you downloaded a test in a ZIP from the internet and the advice was to unblock the ZIP. But I copied the files over the network from my developer system to the test PCs and the files were not blocked.

Searching more for the error code 0x80131515 I found this answer in the MSDN forum.

So I edited the file

C:\Program Files (x86)\Microsoft Visual Studio 11.0\Common7\IDE\CommonExtensions\Microsoft\TestWindow\vstest.console.exe.config

and added the entry <loadFromRemoteSources enabled="true" /> under the runtime tag and voilá, the tests run fine without any issues from a scheduled task.

Maybe this helps other users who also run into this strange issue.

answered on Stack Overflow Dec 21, 2015 by magicandre1981

As previously stated, a Zip file is blocked when downloaded from an untrusted site. If you are confident the site is reliable you can prevent this behavior by adding it to your trusted sites list in Internet Explorer -> Tools Menu -> Internet Options -> Security Tab -> Trusted Sites. Future downloads will not be marked as blocked.

For blocked files that have already been extracted, run this at a Powershell prompt to unblock all the files in the current folder and subfolders:

Get-ChildItem *.* -Recurse | Unblock-File
answered on Stack Overflow Sep 7, 2018 by Rich Moss • edited Sep 15, 2018 by Rich Moss

1) go to exe file click the properties

2) click the unblock button

then this will slove

answered on Stack Overflow Oct 21, 2019 by Ishara Samintha

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