Hi this is also happening to me. I get the same error message, but the file does appear to save but when i then try to open this file i get thisr error message http://kbase.vectorworks.net/questions/1152/%22This+is+an+unrecognized+file.%22+Error+Message
Trying to save on local server which is a NAS which all staff access via a common username/password. Nobody else has ever opened the file or is attempting to open the file. It saves fine on my desktop.
Any ideas why this is happening?
Thanks.