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Home/ Questions/Q 6390393
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Editorial Team
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Editorial Team
Asked: May 25, 20262026-05-25T03:32:36+00:00 2026-05-25T03:32:36+00:00

I am unable to open CSS files in Visual Studio 2010 after adding to

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I am unable to open CSS files in Visual Studio 2010 after adding to a project.

It shows the following error:

The operation could not be completed.Unspecified error.

Even if I try to edit embedded CSS in a webpage directly, IntelliSense doesn’t appear.

The screenshot of the error.

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  1. Editorial Team
    Editorial Team
    2026-05-25T03:32:36+00:00Added an answer on May 25, 2026 at 3:32 am

    I found the solution from here:

    I was having the same issue and found that by going to the Tools -> Extension Manager -> Online Gallery and search for/install the “Web Standards Update for Microsoft Visual Studio 2010 sp1” I was able to open CSS files again.

    And it worked for me.

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