Alphabetic File Extension List

The file extension list you requested is shown on this page. It loads as a table so please give it a moment as some of the lists are quite long. These lists contain basic information: the extension, the name of the program it works with, the specific function of the file, and the company that makes the program. Not all extensions have all of the data. Click on the extension of interest to see the detail page for that extension. Total extensions in this particular list: 97.

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

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