What is a .wmv file?

WMV is Microsoft's proprietary video format — once the default for Windows Media Player and Movie Maker, now largely abandoned with minimal support outside Windows. WMV was everywhere during the Windows XP and Vista era — bundled with Windows Media Player, used by webcams, encoded by Movie Maker. Then the world moved on. Macs struggle with it, phones ignore it, and web browsers pretend it does not exist. If you have WMV files from the mid-2000s, they still contain your data — you just need to convert them to MP4 to use them anywhere modern.