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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	文言