Img_3147.m4v

While macOS and iOS handle these natively, Windows Media Player might struggle.

If you see IMG_3147.M4V on your computer, it usually means you recently imported photos and videos via a USB cable or "Image Capture" on Mac. Apple uses a sequential naming system; IMG_3146 would be the photo or video taken just before this one, and IMG_3148 would be the one after. IMG_3147.M4V

Surprisingly, you can often just change the extension from .m4v to .mp4 manually, and most players will still read it. While macOS and iOS handle these natively, Windows