I have scoured the internet and these forums but can't find a definitive answer.
When trying to open a PDF on a WebDAV folder from Acrobat Pro/Reader (File->Open), I get this error: "Adobe Reader could not open 'filename' because it is either not a supported file type or because the file has been damaged."
However, if I double-click the PDF from the WebDAV folder, Pro/Reader will open it. Performing a File->Open will not work.
This behavior happens on any XP machines that I try.
Note: This is NOT the the syntax error that is remedied with MS KB943337.