This is the initial blogged version of the fixes for ASP.NET 2.0 and ASP.NET 4 updated *.browser files.
These files fix this reported issue: http://connect.microsoft.com/VisualStudio/feedback/details/675737
This includes browser files for IE10 and FF5 on ASP.NET 4 and IE10 on ASP.NET 2.0.
You can update your entire machine's browser files.
1. Copy the files from the .\machines folder into \Windows\Microsoft.NET\Framework\v4.0.30319\Config\Browsers, overwriting your previous versions
2. Open an elevated command prompt and run \Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_regbrowsers.exe -i
3. Restart IIS (e.g., with iisreset)
Note that the files in the .\projects folder of this zip file are different from those in the .\machines folder. To update a single project, copy the files from the .\projects folder of the zip file to ~\App_Browsers in your project.
That said, the easiest way to update a single project is to use NuGet.
For .NET 4
PS> install-package App_BrowsersUpdate
For .NET 2.0 (or use the nuget.exe command line.)
NOTE: NuGet.exe uses .NET 4, so if your machine only has .NET 2, then you'll need to copy the files manually.
PS> install-package App_BrowsersUpdate.net20