| wmx | Windows Media Redirector |
| wtv | Windows Media Center Recorded TV |
| wvh | WebView Livescope Viewer Video |
| wvm | WideVine DRM Protected Video |
| wvx | Windows Media Video Redirector |
| x264 | H.264 Bitstream |
| xas | Sony Playstation Video |
| xesc | Microsoft Expression Encoder Screen Capture |
| xlmv | Xunlei Movie |
| xmv | Xenon Motion Video |
| xpv | Pelco Security Camera Video |
| xvid | Microsoft Video for Windows Movie |
| y4m | YUV4MPEG2 Video |
| ymv | Yabause Movie |
| yog | Outerra Captured Video File |
| yuv | Uncompressed YUV Video |
| zeg | ZeroG Subtitles |
| zm | ZSNES Movie |
| zm1 | ZSNES Movie |
| zm2 | ZSNES Movie |
| zm3 | ZSNES Movie |
| zmv | ZSNES Movie |