| wmf | Windows Metafile |
| wmp | Windows Media HD Photo |
| wnd | Atari 8-bit Blazing Paddles Window Image |
| wpb | OpenCanvas 1.0 Image |
| wpe | OpenCanvas 1.1 Event |
| wpg | Corel WordPerfect Graphics Metafile |
| wpg2 | Corel WordPerfect Graphics Metafile |
| wsq | Wavelet-packet Scalar Quantization Bitmap |
| x | Stardent AVS X Image |
| x | X11 Server Import Image |
| x11 | X Window Dump |
| x2d | IWork X2D Graphics Format Data |
| x3f | Sigma RAW Image |
| xar | Xara Drawing |
| xb | XBin Image |
| xbm | X Bitmap Image |
| xcf | Gimp Image |
| xcfbz2 | Gimp BZip2 Compressed XCF |
| xep | XenoDream Graphics Data |
| xface | X-Face Image |
| xfx | OAZ Fax Image |
| xga | Atari Falcon XGA Image |
| xif | Pagis Pro Scanned Image |
| xifs | PixInsight XIFS Data |
| xim | XImage Bitmap |
| ximg | Atari ST Extended GEM Bit Image |
| ximg | IDV Image XML |
| xisf | PixInsight XISF Data |
| xjt | Gimp Jpeg-Tar File |
| xlp | Atari 8-bit XL-Paint Image |
