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You can upload the MP4 to the Adobe Express Video Editor to trim the clip, add text overlays, and apply filters.
If you simply need to see what the file is before editing it:
For a Mac, QuickTime supports MP4 and on Windows, you can use Windows Media Player. How to play MP4 files in Windows - Microsoft Support
Right-click the file and select Open with > Windows Media Player .
Use QuickTime Player , which natively supports MP4 files.
Use the Clideo MP4 to MP3 tool or HappyScribe to pull the audio from the file. 🖥️ Viewing the File
If the "feature" you want is actually the soundtrack or a podcast-style clip, you can convert the MP4 into an MP3: