| File extension | The full name of the file |
|---|---|
| File extension Y | Amiga Yabba Compressed Archive Format |
| File extension Y01 | Corel Paradox Secondary Index |
| File extension Y02 | Corel Paradox Secondary Index |
| File extension Y03 | Corel Paradox Secondary Index |
| File extension Y04 | Corel Paradox Secondary Index |
| File extension Y05 | Corel Paradox Secondary Index |
| File extension Y06 | Corel Paradox Secondary Index |
| File extension Y07 | Corel Paradox Secondary Index |
| File extension Y08 | Corel Paradox Secondary Index |
| File extension Y09 | Corel Paradox Secondary Index |
| File extension Y3A | Yu-Gi-Oh! Online Avatar Format |
| File extension Y3D | Yu-Gi-Oh! Online Card Format |
| File extension Y3P | Yu-Gi-Oh! Online Profile |
| File extension Y3T | Yu-Gi-Oh! Online Tag |
| File extension Y4M | YUV4MPEG2 Video Format |
| File extension Y8PD | Password Finder Yahoo! Mail / Yahoo! Messenger Exported Password |
| File extension YAB | Yabasic Source Code |
| File extension YADPCM | Raw Yamaha 4-bit ADPCM Format |
| File extension YAH | HeartBeat |
| File extension YAJL | YAJL Script |
| File extension YAK | KayakFoundry 3D Design |
| File extension YAL | Arts & Letters Clipart Library Format |
| File extension YAM | Yahoo! Auctions Data Format |
| File extension YAML | YAML Document |
| File extension YAODL | Powerflip 3D Image Format |
| File extension YAR | StarBoard Document |
| File extension YAST | YaST |
| File extension YAWS | Yaws Source |
| File extension YBC | SUSE Linux Enterprise Server Display Settings |
| File extension YBD | YobiDrive Link Format |
| File extension YBHTM | YBook HTML |
| File extension YBK | Microsoft Encarta Yearbook Format |
| File extension YBM | Ad-Aware 2007 |
| File extension YBRAR | Ybook Ebook |
| File extension YBRTF | Ybook Ebook |
| File extension YBTXT | Ybook Ebook |
| File extension YCHAT | Yahoo! Instant Messenger Chat Log Format |
| File extension YCM | Yugioh Card Maker Format |
| File extension YCP | SUSE Linux Enterprise Server Display Settings |
| File extension YCT | YahELite Chat Transcript |
| File extension YDC | Konami Yu-Gi-Oh! Card Deck Format |
| File extension YDL | Powerflip YAODL 3D Image Format |
| File extension YDR | Yu-Gi-Oh! Power Of Chaos Replay Format |
| File extension YDT | Konami Yu-Gi-Oh! Power Of Chaos Data Format |
| File extension YEL | Yellow Color Separation |
| File extension YENC | YEnc Encoded Archive |
| File extension YFS | YSFLIGHT Mission Format |
| File extension YG0 | Corel Paradox Secondary Index |
| File extension YG1 | Corel Paradox Secondary Index |
| File extension YG2 | Corel Paradox Secondary Index |
| File extension YG3 | Corel Paradox Secondary Index |
| File extension YG4 | Corel Paradox Secondary Index |
| File extension YGF | YWorks Binary Graph Format |
| File extension YGN | YGen |
| File extension YIF | Mungyodance Game Data |
| File extension YKA | Yenka Model Format |
| File extension YM | AY-3-8910 Audio Format |
| File extension YMAP | MindGenius Computer Aided Thinking Format |
| File extension YMBK | Xilisoft Mobile Manager Phonebook |
| File extension YMG | Yahoo! Messenger Format |
| File extension YML | YAML Document |
| File extension YML2 | YML Script Format |
| File extension YMP | YaST Metapackage Format |
| File extension YNC | YEnc Encoded Format |
| File extension YOG | Outerra Recorded Video Format |
| File extension YOOKOO | Yookoo Player Playlist Format |
| File extension YOS | HP Photosmart Essential Thumbnail Cache |
| File extension YPC | WhyPic Picture |
| File extension YPF | YahELite Configuration |
| File extension YPR | BYOB Project Format |
| File extension YPS | Yahoo! Instant Messenger Format |
| File extension YRCBKM | YRC Weblink Bookmarks Archive |
| File extension YRM | Red Alert 2: Yuris Revenge Multiplayer Map |
| File extension YRP | YGOPro Replay |
| File extension YSE | Yamaha Studio Manager Session |
| File extension YSM | Yamaha Studio Manager |
| File extension YSP | BYOB Sprite Format |
| File extension YSS | YcySoft Screen Saver Producer |
| File extension YTF | Google Picasa Font Cache |
| File extension YTI | Google Picasa Plugin |
| File extension YTIF | Independence Instrument |
| File extension YTR | I.R.I.S. OCR Data |
| File extension YUV | YUV 16Bits Image Format |
| File extension YW3 | YWriter 3 Project |
| File extension YW4 | YWriter 4 Project |
| File extension YW5 | YWriter 5 Project |
| File extension YWEMANIFEST | Yahoo! Widgets Manifest |
| File extension YWL | YoWindow Data |
| File extension YWP | YWriter 2 Project |
| File extension YZ | YAC Compressed Archive Format |
| File extension YZ1 | Yamazaki Zipper Archive |
File extensions in alphabetical order: Y
The list of file extensions, sorted alphabetically, beginning with the letter Y