File extension	The full name of the file	Popularity
File extension Y	Yacc Source File
File extension Y3A	Yu-Gi-Oh! ONLINE 3 Avatar File
File extension Y3D	Yu-Gi-Oh! ONLINE 3 Deck File
File extension Y4M	YUV4MPEG2 Video File
File extension YAB	Yabasic Source Code
File extension YAL	Arts & Letters Clipart Library
File extension YAM	Yahoo! Auctions Data
File extension YAML	YAML Document
File extension YAODL	PowerFlip 3D Image File
File extension YBD	YobiDrive Link File
File extension YBK	YanCEyWare eBook
File extension YCHAT	Yahoo! Messenger Chat Log
File extension YCM	Yugioh Card Maker File
File extension YDC	Yu-Gi-Oh! Card Deck File
File extension YDL	PowerFlip YAODL 3D Image File
File extension YDR	Yu-Gi-Oh! Power of Chaos Replay File
File extension YDT	Yu-Gi-Oh! Power of Chaos Data File
File extension YENC	yEnc File
File extension YFS	YSFLIGHT Mission File
File extension YGF	Y Graph Format File
File extension YKA	Yenka Model File
File extension YM	Atari ST Audio File
File extension YMG	Yahoo! Messenger File
File extension YML	YAML Document
File extension YML2	YML Script
File extension YMP	YaST Metapackage File
File extension YNC	yEnc Encoded File
File extension YOG	Outerra Captured Video File
File extension YOOKOO	Yookoo Player Playlist File
File extension YPR	BYOB Project File
File extension YPS	Yahoo! Messenger Data File
File extension YSP	BYOB Sprite File
File extension YTF	Google Picasa Font Cache
File extension YUV	YUV Encoded Image File
File extension YZ	YAC Compressed File
File extension YZ1	Yamazaki ZIPPER File