File Extensions Abbreviations and Acronyms
- XWSXara Web Designer Graphic
- XXXXdecode - XXencode Encoded file archive ( ASCII)
- XXXxencoded File
- XXEXXencode Encoded file archive ( ASCII)
- XXEXxencoded File
- XXXCompucon Singer Embroidery File
- XYXY Write Text document
- XYXywrite Document
- XYPXYWrite III Plus Text document
- XYPXywrite Plus Document
- XYSXyplorer Script File
- XYWXYWrite for Windows Text document
- XYWXywrite for Windows Document
- XYZCelestia Sampled Trajectory Data File
- XYZMolecule Specification File
- XZXz Compressed Archive
- YABYabasic Source Code
- YALClipart library - Arts & Letters
- YALArts & Letters Clipart Library
- YAMYahoo! Auctions Data
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