Starting with a character: : Y

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