Description:
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When installing the php 4.3.10 isapi filter as explained in the documentation /mailing lists/ websites 
The installation works as long as it is done in the standard website of iis or a regular folder (normally locate in c:\inetpub\wwwroot). 
A test file (test.php) containing the  <? phpinfo(); ?> returns the standard info page. 
When running the same file from a virtual dir (with the correct config settings) this results in a blank page.

When setting up a different site (on the same server but accessed thru a different port) the page returns a 404 error. Eventhough the the security settings of the standard site and the alternate site are the same. Changing the extesion of the test.php to test.txt on the alternate site will show the source code of the php file

Reproduce code:
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Expected result:
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Actual result:
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na