| .USTAR | Smith Micro Software | Fişiere de date | Uniform Standard Tape Archive Format File | Smith Micro StuffIt Deluxe | Smith Micro Software |
| .UU | Open Source | Fişiere criptate | Uuencoded File | Smith Micro StuffIt Deluxe | Smith Micro Software |
| .UUE | Open Source | Fişiere criptate | Uuencoded File | Smith Micro StuffIt Deluxe | Smith Micro Software |
| .WAR | Oracle Corporation | Fişiere comprimate | Java Web Archive | Smith Micro StuffIt Deluxe | Smith Micro Software |
| .WMZ | Microsoft Corporation | Fişiere de setări | Compressed Windows Media Player Skin | Smith Micro StuffIt Deluxe | Smith Micro Software |
| .Y | Microsoft Corporation | Fişiere de imagini rastru | Subsampled Raw YUV Image | Smith Micro StuffIt Deluxe | Smith Micro Software |
| .YENC | Open Source | Fişiere criptate | yEnc File | Smith Micro StuffIt Deluxe | Smith Micro Software |
| .YNC | Open Source | Fişiere criptate | yEnc Encoded File | Smith Micro StuffIt Deluxe | Smith Micro Software |
| .Z | Smith Micro Software | Fişiere comprimate | Unix Compressed File | Smith Micro StuffIt Deluxe | Smith Micro Software |
| .Z01 | Corel | Fişiere comprimate | WinZip First Split Zip File | Smith Micro StuffIt Deluxe | Smith Micro Software |
| .Z02 | Corel | Fişiere comprimate | WinZip Second Split Zip File | Smith Micro StuffIt Deluxe | Smith Micro Software |
| .Z03 | Corel | Fişiere comprimate | WinZip Third Split Zip File | Smith Micro StuffIt Deluxe | Smith Micro Software |
| .Z04 | Corel | Fişiere comprimate | WinZip Fourth Split Zip File | Smith Micro StuffIt Deluxe | Smith Micro Software |
| .Z05 | Corel | Fişiere comprimate | WinZip Fifth Split Zip File | Smith Micro StuffIt Deluxe | Smith Micro Software |
| .Z06 | Corel | Fişiere comprimate | WinZip Sixth Split Zip File | Smith Micro StuffIt Deluxe | Smith Micro Software |
| .Z07 | Eugene Roshal | Fişiere comprimate | Split Multi-volume RAR Compressed File | Smith Micro StuffIt Deluxe | Smith Micro Software |
| .Z08 | Eugene Roshal | Fişiere comprimate | Split Multi-volume RAR Compressed File | Smith Micro StuffIt Deluxe | Smith Micro Software |
| .Z09 | Eugene Roshal | Fişiere comprimate | Split Multi-volume RAR Compressed File | Smith Micro StuffIt Deluxe | Smith Micro Software |
| .Z96 | Eugene Roshal | Fişiere comprimate | Split Multi-volume RAR Compressed File | Smith Micro StuffIt Deluxe | Smith Micro Software |
| .ZIP | Winrar | Fişiere comprimate | Zipped File | Smith Micro StuffIt Deluxe | Smith Micro Software |
| .ZIP2 | Smith Micro Software | Fişiere comprimate | StuffIt Archive | Smith Micro StuffIt Deluxe | Smith Micro Software |
| .ZPI | Winrar | Fişiere comprimate | Zipped File | Smith Micro StuffIt Deluxe | Smith Micro Software |
din 2 
