Description:
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This is mainly for your information, since it may shed some additional light on problems encountered by other developers, notably the creator of the w32api module.

I recently developed a custom mail server administration extension for PHP in which I access functions in a third-party (i.e. non-MFC) DLL Using LoadLibrary/GetProcAddress. The thus linked DLL functions behave predictably with the CLI version of PHP and on Apache/SAPI compiles. However, with IIS, whether it be ISAPI, CGI or FastCGI, the DLL functions do not return the expected results and may arbitrarily result in PHP engine crashes.

This is obviously an issue with IIS, although I have no ideas on what may cause this kind of problem. Attempting to get to the root of this would be a job for someone with intimate knowledge of IIS. Unfortunately, that excludes me.

Reproduce code:
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This is not a PHP language issue.