The IIS team has officially signed off on the Windows Cache Extension (WinCache) version 1.3 for PHP 5.4, and the files have been uploaded to SourceForge. This version addresses all of the problems that were identified with WinCache 1.1 that customers were seeing after they upgraded their systems from PHP 5.3 to PHP 5.4.
With that in mind, you can download WinCache 1.3 for for PHP 5.4 from the following URL:
Source Code Availability
Since WinCache is an open source project, the IIS team has uploaded the pre-release source code for WinCache at the following URL:
For the instructions on how to build the extension yourself, please refer to the Building WinCache Extension documentation.(Cross-posted from http://blogs.msdn.com/robert_mcmurray/)