| .W3D | Adobe Systems Incorporated | Videodateien | Adobe Shockwave 3D File | Adobe Director | Adobe Systems Incorporated |
| .WAC | Wacom | Textdateien | Inkling Sketch XML File | Adobe Illustrator CC | Adobe Systems Incorporated |
| .WAV | Microsoft Corporation | Audiodateien | WAVE Audio File | Adobe Audition | Adobe Systems Incorporated |
| .WBM | Jamie Cameron | Plugindateien | Webmin Module | Adobe Photoshop Elements | Adobe Systems Incorporated |
| .WBMP | XnSoft | Rasterbilddateien | Wireless Bitmap Image File | Adobe Photoshop Elements | Adobe Systems Incorporated |
| .WDGT | Opera Software | Webdateien | Opera Widget File | Adobe Captivate | Adobe Systems Incorporated |
| .WDP | Microsoft Corporation | Rasterbilddateien | Windows Media Photo File | Adobe Photoshop | Adobe Systems Incorporated |
| .WEBP | Google | Rasterbilddateien | Google Image File Format | Adobe Photoshop | Adobe Systems Incorporated |
| .WFX | Adobe Systems Incorporated | Einstellungsdateien | Adobe User Keyboard Shortcut Settings | Adobe Creative Cloud | Adobe Systems Incorporated |
| .WMF | Microsoft Corporation | Vektorbilddateien | Windows Metafile | Adobe Illustrator CC | Adobe Systems Incorporated |
| .WML | Syncro Soft | Webdateien | Wireless Markup Language File | Adobe Dreamweaver | Adobe Systems Incorporated |
| .WPI | Wacom | Vektorbilddateien | Inkling Sketch Binary File | Adobe Illustrator CC | Adobe Systems Incorporated |
| .WV | David Bryant | Audiodateien | WavPack Audio File | Adobe Audition | Adobe Systems Incorporated |
| .WWF | World Wide Fund (WWF) | Seitenlayoutdateien | World Wide Fund Non-Printable Document | Adobe Acrobat DC | Adobe Systems Incorporated |
| .X-PNG | The Pixelmator Team | Rasterbilddateien | Portable Network Graphics | Adobe Illustrator CC | Adobe Systems Incorporated |
| .X16 | Macromedia | Textdateien | Macromedia Extra Document | Adobe Dreamweaver | Adobe Systems Incorporated |
| .X32 | Adobe Systems Incorporated | Plugindateien | Adobe Xtra File | Adobe Director | Adobe Systems Incorporated |
| .X3F | SIGMA Corporation | Kamerarohdaten | SIGMA X3F Camera RAW File | Adobe Photoshop CC | Adobe Systems Incorporated |
| .XCI | Adobe Systems Incorporated | Einstellungsdateien | Adobe Reader Font Mapping File | Adobe Reader | Adobe Systems Incorporated |
| .XDC | Adobe Systems Incorporated | Einstellungsdateien | Adobe Acrobat Printer Description | Adobe Acrobat DC | Adobe Systems Incorporated |
| .XDP | Adobe Systems Incorporated | Textdateien | XML Data Package | Adobe Acrobat DC | Adobe Systems Incorporated |
| .XFD | JetForm | Textdateien | FormFlow 99 Form Data File | Adobe Acrobat DC | Adobe Systems Incorporated |
| .XFDF | Adobe Systems Incorporated | Textdateien | Adobe Acrobat XFDF File | Adobe Acrobat DC | Adobe Systems Incorporated |
| .XFL | Adobe Systems Incorporated | Videodateien | Adobe Flash Exchange File | Adobe Animate CC 2017 | Adobe Systems Incorporated |
| .XFT | Cay Horstmann | Fontdateien | ChiWriter Printer Font | Adobe LiveCycle ES4 | Adobe Systems Incorporated |
| .XHTM | Opera Software | Webdateien | Extensible Hypertext Markup Language Document | Adobe Dreamweaver | Adobe Systems Incorporated |
| .XHTML | Opera Software | Webdateien | Extensible Hypertext Markup Language Document | Adobe Dreamweaver | Adobe Systems Incorporated |
| .XMO | Adobe Systems Incorporated | Systemdateien | Adobe Authorware Movie Driver | Adobe Authorware | Adobe Systems Incorporated |
| .XMP | Adobe Systems Incorporated | Sonstige Dateien | Extensible Metadata Platform File | Adobe Photoshop | Adobe Systems Incorporated |
| .XMPSES | Adobe Systems Incorporated | Textdateien | Adobe Premiere Elements Data | Adobe Premiere Elements | Adobe Systems Incorporated |
| .XPJ | Adobe Systems Incorporated | Textdateien | RoboHelp HTML Project | Adobe RoboHelp | Adobe Systems Incorporated |
| .XPR | Parametric Technology Corporation | 3D-Dateien | Pro/ENGINEER Part Instance Accelerator File | Adobe Acrobat DC | Adobe Systems Incorporated |
| .XSLT | Syncro Soft | Textdateien | XSL Transformation File | Adobe Dreamweaver | Adobe Systems Incorporated |
| .ZVT | Adobe Systems Incorporated | Einstellungsdateien | Photoshop Zoomify Preset File | Adobe Photoshop CC | Adobe Systems Incorporated |
| .ZXP | Adobe Systems Incorporated | Plugindateien | Extension Manager Package | Adobe Extension Manager CC | Adobe Systems Incorporated |
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