Xdebug does not load Windows 7 64 bit PHP 5.4

I have PHP running on Apache I have downloaded what I think is the correct Xdebug compilation DLL for PHP version 5.4 64 bit window I have thread safety enabled and it is using vc9 I have downloaded the DLL and put it here:

C:\PHP5\extras\PHP_xdebug-2.2.0RC1-5.4-vc9-x86_64.dll

This is me in PHP Contents in ini:

[xdebug]
zend_extension = "C:\PHP5\extras\PHP_xdebug-2.2.0RC1-5.4-vc9-x86_64.dll"

When I start Apache, I get this error:

[Wed Apr 04 17:01:56 2012] [notice] Parent: Received restart signal -- Restarting the server.
Failed loading C:\PHP5\extras\PHP_xdebug-2.2.0RC1-5.4-vc9-x86_64.dll
hild process is ending.
[Wed Apr 04 17:01:56 2012] [notice] Apache/2.2.22 (Win32) PHP/5.4.0 configured -- resuming normal operations
[Wed Apr 04 17:01:56 2012] [notice] Server built: Jan 28 2012 11:16:39
[Wed Apr 04 17:01:56 2012] [notice] Parent: Created child process 2120
[Wed Apr 04 17:01:57 2012] [notice] Child 2120: Child process is running
[Wed Apr 04 17:01:57 2012] [notice] Child 2120: Acquired the start mutex.
[Wed Apr 04 17:01:57 2012] [notice] Child 2120: Starting 64 worker threads.
[Wed Apr 04 17:01:57 2012] [notice] Child 5624: Released the start mutex
[Wed Apr 04 17:01:58 2012] [notice] Child 5624: All worker threads have exited.
[Wed Apr 04 17:01:58 2012] [notice] Child 5624: Child process is exiting
Failed loading C:\PHP5\extras\PHP_xdebug-2.2.0RC1-5.4-vc9-x86_64.dll

Solution

To ensure that you have downloaded the correct binary, you can use http://xdebug.org/wizard.php It will tell you exactly which file to download and which PHP Zend should be placed in the INI file_ Extension line (you are using the correct, of course, when you get the "can't load" error)