Right-click the file and select Open with > Media Player or Movies & TV . macOS: Use QuickTime Player or IINA .
Use a tool like MediaInfo to view the resolution, frame rate, and internal encoding (e.g., H.264 or H.265). 3. Troubleshooting "File Not Playing"
Look for "Properties" (Windows) or "Get Info" (macOS) to see the "Where from" or "Source" URL if it was downloaded via a browser.
In some cases, system-named files (like those from streaming services) are DRM-protected and will only play within the original app. 4. Converting the Format