Add file from within an external project to a local project

I'm using the svn:external to get projects like Nlog and Lucene.net. They don't have a vs2008 csproj file. I can create that one easely so I can add it to other projects. Is it now possible to add this 2008 project file to our internal source control?

Solution

In this regard, SVN works folder-based. If a folder is checked out as "external" to some working copy, you cannot add anything in there to the working copy itself.

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