Windows Longhorn build 4090
| Build of Windows Longhorn | |
 | |
| OS family | Windows NT |
|---|---|
| Version number | 6.0 |
| Build number | 4090 |
| Build lab | private/lab06_dev_ux |
| Compiled on | 2004-07-29 |
Windows Longhorn build 4090 is a private Milestone 8 build of Windows Longhorn. Traces of this build were found in build 4085 (private/Lab06_dev_ux(pfortier))'s Explorer demo files, which included all files except explorer.exe.[1]