SharePoint Designer 2010 beta Error – The server extensions were unable to access the file “”.

SharePoint Designer 2010 beta Error – The server extensions were unable to access the file “”.

I ran into an issue where I was unable to open some files in the beta of SharePoint Designer 2010 from the server (i.e. .css files or .aspx files).  I was getting the message:

“The server extensions were unable to access the file “”.  Please check the file permissions.  Contact your Internet service provider or Web server administrator for more information.

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Similarly to the old SharePoint Designer 2007 solution, I was able to resolve this issue by clearing the WebsiteCache directory on my local environment.  Just delete all the content from this directory:

Vista/Window 7/Windows 2008:

%UserProfile%AppDataLocalMicrosoftWebsiteCache

Refer to this post for more information [1].

[1] http://www.jwc3.net/2008/05/sharepoint-designer-out-of-sync-with.html

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