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XX	XX34	XXBUG
XYZ (RPG Maker)	XZ	X (DirectX)
X (X1)	X Keymap	X Window System
X windows	Xanadoc	Xanadu
Xanga	Xar	Xar (Extensible Archive)
Xar (eXtensible ARchive)	Xar (vector graphics)	Xara
Xbill.scores	Xbox Live Avatar	Xcode Playground
Xcode Project	Xcom (PTS)	Xcursor
Xenon	Xerox Doodle brush	Xerox EDMICS-MMR
Xerox EDMICS-RLC	XiE	Xiafs
Xiao Steganography	Xiaomi backup folder	Xidie Secure Archives
Xidie Security Suite	Xidie archive	Xim
XnView	XnView Frame	Xnconvert
Xpa32	XtreemFS	Xtremeworlds PWX
Xtremeworlds map	XviD	Xvimage
Xwindows	Xxencoding	YAC
YAFA	YAFFS	YAML
YAML Ain’t Markup Language	YBM	YEnc
YM	YMODEM	YUSCII
YUV	Yahoo Groups	Yamazaki zipper archive
Yass-js	Yaz0	Yaz0 (Nintendo)
Yeo	Yobj	YouTube
Young Picasso	Z	Z-File Camouflage/Encryption System
Z-code	Z-machine XZIP Picture Library	Z/Install
Z/Install Lite	Z3D	Z85
ZAP	ZAR (Zip-Archiv)	ZBR (Zoner Zebra)
ZCI	ZED	ZEDCOM
ZFS	ZFS (IBM)	ZIL
ZIM	ZIP	ZIPD
ZIPI	ZMF (Zoner)	ZMODEM
ZOO	ZPAQ	ZPAQL
ZPack (LeadRDRK)	ZPack Lite	ZSCII
ZSQ	ZSQ (LZW compression)	ZSoft ZPK2
ZXT/ZAX	ZX Microdrive	ZX Spectrum Beta Disc 3.5" floppy
ZX Spectrum Beta Disc 5.25" floppy	ZZT	ZZ ROUGH
Zbrush MatCap	Zcash	Zchunk
Zeiss BIVAS	Zelda Solarus DX saved game	Zeno
Zet	Zig Zag Ancient Greeks	Zilite
Zip/rar.mp3	Zip disk	Zipped Steganography
Zipx	Zisofs	Zj-Stream
Zlib	Zone file	Zoo
Zoo Z format	Zoo filter format	ZoomBrowser Ex thumbnail cache
Zoom Project Settings	Zoomify PFF	Zoomify ZIF
Zotero	Zpack	Zpng
Zsound Music	Zstandard	Zstandard dictionary
Zstd	Zzip	Ć
Μ-law	Π	Πfs
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