extension indicates this is a Windows Media Video file, which was a standard digital distribution format for adult content during the late 2000s.
On LimeWire, Kazaa, and eMule, searching for "secretary" would pull up thousands of mislabeled files—virus-laden .exe files, Rick Astley pranks, or corrupted videos of filing cabinets. But the Bree Olson file was trusted. It was a verified classic. In the Wild West of early content sharing, this file was gold.