Windows 10 build 10240 (winmain_prs)
| Build of Windows 10 | |
 | |
| OS family | Windows NT |
|---|---|
| Version number | 10.0 |
| Build number | 10240 |
| Build revision | 0 |
| Architecture | x64 |
| Build lab | winmain_prs |
| Compiled on | 2015-07-09 |
| Expiration date | |
| Timebomb | 2015-10-02 (+85 days) |
| SKUs | |
| Pro Preinstallation Environment | |
Windows 10 build 10240 (winmain_prs) is an unleaked build of Windows 10. A photo of the winver dialog was shared on a BetaArchive topic on 14 July 2015.[1] A screenshot of the Windows Preinstallation Environment was shared on 27 June 2019 along with a copy of its shell32.dll file. This build was also shown on a prototype Surface Pro 4 that was sent to the Federal Communications Commission.[2] Due to the branch, it has a timebomb, and reuses the Windows branding from builds 9821 to 10166 instead of the Windows 10 one.
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