since 2000
Alphabetic File Extension List: y
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: 107.
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| Extension | Information |
| Y | AmigaOS compressed archive file (Hyperion Entertainment) |
| Y | QuickTime raster image (Apple) |
| Y | Windows Media Player raster image (Microsoft) |
| Y | Xcode grammar file (Apple) |
| Y | Yacc grammar file (Stephen C Johnson) |
| 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 |
| YAML | Atom application data (GitHub) |
| YAML | AWS CloudFormation template (Amazon) |
| YAML | Swagger resource (SmartBear) |
| YAML | Visual Studio Code application data (Microsoft) |
| YAP | Castles & Catapults Game File (Infogrames Entertainment SA) |
| YAR | Castles & Catapults Game File (Infogrames Entertainment SA) |
| YAR | YAR Archive |
| 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 |
| YCD | Rockstar Games titles (e.g., Grand Theft Auto series) Game Data Container |
| YCT | YahELite Chat Transcript (David J. Binette) |
| YDC | Yu-Gi-Oh! Power of Chaos Card Deck (Konami Group) |
| YDD | OpenIV 3D skeletal animation |
| YDK | Yusuf Data Recovery |
| YDL | YAODL 3D Scene Description (Silicon Graphics, Inc.) |
| YDO | Yarston Text Editor Text Document (YARSTON) |
| YDR | GTA V (Grand Theft Auto V) 3D model |
| YEL | Yellow Color Separation (Adobe Systems Incorporated) |
| YENC | yEnc Encoded File |
| YFT | OpenIV 3D model data |
| YG0 | Paradox Secondary Index |
| YG1 | Paradox Secondary Index |
| YG2 | Paradox Secondary Index |
| YG3 | Paradox Secondary Index |
| YG4 | Paradox Secondary Index |
| YG5 | ZKTeco Biometric Devices and Software Biometric Data |
| 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 | Graphic |
| YIF | Mungyodance Game Data (VULPvibe) |
| YINS | Castles & Catapults Game File (Infogrames Entertainment SA) |
| YJF | Amazon Kindle Kindle ebook file |
| YJR | Amazon Kindle Kindle ebook metadata |
| 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.) |
| YMF | Grand Theft Auto V Game Data File |
| YMG | Yahoo! Instant Messenger (Yahoo!) |
| YML | Atom application data (GitHub) |
| YML | Ruby on Rails database connection configuration (Ruby on Rails Project) |
| YML | Sailfish Yacht Analyzer data (Techsail) |
| YML | Visual Studio Code application data (Microsoft) |
| YMP | MicroSim PCBoard Mapping File |
| YMP | openSUSE One Click Install Metapackage (Novell, Inc.) |
| YMT | Grand Theft Auto V 3D Models/Game Assets |
| YMY | Castles & Catapults Game File (Infogrames Entertainment SA) |
| YN | Audio Utility Tuningwrench Compressed File |
| YNC | yEnc Encoded File |
| YNX | Seqmax Seqprest Compressed Audio File |
| 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 |
| YTD | Rockstar Games titles Texture Dictionary |
| YTR | I.R.I.S. OCR Data (I.R.I.S. s.a.) |
| YTYP | CodeWalker by OpenIV 3D model data |
| YUV | MPlayer video (Mplayer Team) |
| YUV | XnView image (XnSoft) |
| YUV3 | CCIR 601 2:1:1 Bitmap |
| YWEMANIFEST | Yahoo! Widget Manifest File (Yahoo! Inc.) |
| YWP | yWriter Project (Spacejock Software) |
| YY | GameMaker Studio 2 GameMaker Resource File |
| YYC | Wave Sapphire Distribution File |
| YYP | GameMaker Studio 2 GameMaker Project |
| YYZ | GameMaker Studio GameMaker project (YoYo Games) |
| YYZA | Locky Ransomware Encrypted Files |
| YZ | YAC archived file |
| YZ1 | DeepFreezer Compressed Archive (BinaryTechnology) |
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