You may not use Microsoft WebMatrix 2 Beta if your region format is not English. In that case you will probably see “index was outside the bounds of the array” when you try to edit files. I wrote a quick workaround in Powershell to solve this problem.

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Set-ItemProperty -Path "Registry::HKEY_CURRENT_USER\Control Panel\International" -Name LocaleName -Value en-GB
& ${Env:ProgramFiles(x86)}"\Microsoft WebMatrix\WebMatrix.exe"
Start-Sleep 10
Set-ItemProperty -Path "Registry::HKEY_CURRENT_USER\Control Panel\International" -Name LocaleName -Value tr-TR

You should use this script to start WebMatrix 2 Beta. You can change shortcut path to execute this script as well.

Applied to: PowerShell v2, PowerShell v3