".vsd" is not a recommended image file format. I still get the error after changing $wgFileExtensions[] = 'pdf'; to $wgFileExtensions[] = array('pdf','vsd'); Is there something else I have to do? Should the changes be instant?
Is that in LocalSettings.php? If you edited DefaultSettings.php, undo it, and copy the line into LocalSettings.php, and add the .vsd extension.
-Justin
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