File Extension Y - Amiga Yabba Compressed Archive (Amiga), etc
File Extension Y01 - Paradox Secondary Index , etc
File Extension Y02 - Paradox Secondary Index , etc
File Extension Y03 - Paradox Secondary Index , etc
File Extension Y04 - Paradox Secondary Index , etc
File Extension Y05 - Paradox Secondary Index , etc
File Extension Y06 - Paradox Secondary Index , etc
File Extension Y07 - Paradox Secondary Index , etc
File Extension Y08 - Paradox Secondary Index , etc
File Extension Y09 - Paradox Secondary Index , etc
File Extension Y2 - Plugh! , etc
File Extension Y64 - Commandos 2 Game Mission , etc
File Extension YAB - Yabasic Source , etc
File Extension YAL - Arts & Letters Clipart , etc
File Extension YANK - Unknown Apple II File (found on Golden Orchard Apple II CD Rom) , etc
File Extension YAP - Castles & Catapults Game File (Infogrames Entertainment SA), etc
File Extension YAR - Castles & Catapults Game File (Infogrames Entertainment SA), etc
File Extension YBAK - MindGenius Computer Aided Thinking File Backup (Gael Ltd.), etc
File Extension YBHTM - yBook HTML File (Spacejock Software), etc
File Extension YBK - Encarta Yearbook (Microsoft Corporation), etc
File Extension YBM - Face Bitmap , etc
File Extension YBS - YBS Compressed Archive , etc
File Extension YBTXT - yBook Text File (Spacejock Software), etc
File Extension YC - YAC Compressed Archive , etc
File Extension YCT - YahELite Chat Transcript (David J. Binette), etc
File Extension YDC - Yu-Gi-Oh! Power of Chaos Card Deck (Konami Group), etc
File Extension YDK - Yusuf Data Recovery , etc
File Extension YDL - YAODL 3D Scene Description (Silicon Graphics, Inc.), etc
File Extension YDO - Yarston Text Editor Text Document (YARSTON), etc
File Extension YEAH - Unknown Apple II File (found on Golden Orchard Apple II CD Rom) , etc
File Extension YEAR - Unknown Apple II File (found on Golden Orchard Apple II CD Rom) , etc
File Extension YEL - Yellow Color Separation (Adobe Systems Incorporated), etc
File Extension YENC - yEnc Encoded File , etc
File Extension YG0 - Paradox Secondary Index , etc
File Extension YG1 - Paradox Secondary Index , etc
File Extension YG2 - Paradox Secondary Index , etc
File Extension YG3 - Paradox Secondary Index , etc
File Extension YG4 - Paradox Secondary Index , etc
File Extension YGD - Yougoodai Playlist (mode2), etc
File Extension YGF - yEd Graph Editor Y Graph Format (yWorks), etc
File Extension YGM - YahooGroupManager Ver. 1.x Database (GGNetworks), etc
File Extension YGM2 - YahooGroupManager Ver. 2.x Database (GGNetworks), etc
File Extension YGN - yGen Project File (Spacejock Software), etc
File Extension YGO - Paradox Database-related File , etc
File Extension YHF - Your Honey Frame Shape File (HotBounce programming & development), etc
File Extension YIF - Graphic , etc
File Extension YINS - Castles & Catapults Game File (Infogrames Entertainment SA), etc
File Extension YKEY - Castles & Catapults Game File (Infogrames Entertainment SA), etc
File Extension YLD - SMS Yield Monitor Data File (Ag Leader Technology, Inc.), etc
File Extension YLT - TheWord & Bible Companion Young's Literal Translation Bible , etc
File Extension YM - Atari ST YM2149 Module/Song (Atari), etc
File Extension YMA - YMAG Center Data Exchange File (Ymag), etc
File Extension YMACRO - YaHoE File , etc
File Extension YMAP - MindGenius Computer Aided Thinking File (Gael Ltd.), etc
File Extension YMG - Yahoo! Instant Messenger (Yahoo!), etc
File Extension YML - Ruby on Rails Database Configuration File (Ruby on Rails Project), etc
File Extension YMP - MicroSim PCBoard Mapping File , etc
File Extension YMY - Castles & Catapults Game File (Infogrames Entertainment SA), etc
File Extension YN - Audio Utility Tuningwrench Compressed File , etc
File Extension YNC - yEnc Encoded File , etc
File Extension YNX - Seqmax Seqprest Compressed Audio File , etc
File Extension YORK - Unknown Apple II File (found on Golden Orchard Apple II CD Rom) , etc
File Extension YOU - Unknown Apple II File (found on Golden Orchard Apple II CD Rom) , etc
File Extension YOUD - Unknown Apple II File (found on Golden Orchard Apple II CD Rom) , etc
File Extension YPCL - Castles & Catapults Game File (Infogrames Entertainment SA), etc
File Extension YPF - YahELite Configuration (David J. Binette), etc
File Extension YPK - MicroSim PCBoard Mapping File , etc
File Extension YPL - Yahoo! Player Playlist , etc
File Extension YPS - Yahoo! Instant Messenger (Yahoo!), etc
File Extension YPT - Cryptic File , etc
File Extension YRM - Command & Conquer Yuri's Revenge Unofficial Multiplayer Map (Westwood Studios), etc
File Extension YRO - Command & Conquer Yuri's Revenge Official Multiplayer Map (Westwood Studios), etc
File Extension YSE - Yamaha Studio Editor Session File (Yamaha Corporation), etc
File Extension YSM - Yamaha Studio Manager Session File (Yamaha Corporation), etc
File Extension YSP - Bitmap Graphic , etc
File Extension YTR - I.R.I.S. OCR Data (I.R.I.S. s.a.), etc
File Extension YUV - Color Space Pixel Format , etc
File Extension YUV3 - CCIR 601 2:1:1 Bitmap , etc
File Extension YV - Unknown Apple II File (found on Golden Orchard Apple II CD Rom) , etc
File Extension YV2 - Unknown Apple II File (found on Golden Orchard Apple II CD Rom) , etc
File Extension YWEMAN - Yahoo! Widget Manifest File (Yahoo! Inc.), etc
File Extension YWP - yWriter Project (Spacejock Software), etc
File Extension YYC - Wave Sapphire Distribution File , etc
File Extension YZ - YAC Compressed Archive , etc
File Extension YZ1 - DeepFreezer Compressed Archive (BinaryTechnology), etc