Ferry is correct. The plane is made for FS2004 by a Mr. Varnavsky. (Avsimrus.com is down right now so I can't provide the original source) It looks like the person who uploaded to Simviation simply modified the VC to include gauges that work in FSX or something. I would be thoroughly surprised if this effort and file upload was approved by the original author of the aircraft.
A search of the uploader's name throughout the Simviation file library reveals that this person seems to hash together a variety of other author's aircraft and re-upload them. It's unfortunate that Simviation supports these actions. These aircraft are designed for certain simulators, and the sometimes heavy modification of addons such as these can lead to more problems, and/or a perception that the addon was created to a low standard.