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In the Name box, type Layout. css, and then click Add. The editor opens with a new style sheet that contains an empty body style rule.
How to open a CSS file. You can open and edit CSS files with various web development applications and source code editors. Examples of programs that support CSS files include Adobe Dreamweaver (Windows and macOS), Adobe ColdFusion Builder (Windows and macOS), and Microsoft Visual Studio Code (multiplatform).
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.
Probably it can happen after installing the Visual Studio LightSwitch beta
OR
Windows Azure tools installed
OR
SQL Server 2012 installed
Download this and install it if already installed then repair it and it'll fix the issue:
http://visualstudiogallery.msdn.microsoft.com/a15c3ce9-f58f-42b7-8668-53f6cdc2cd83
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