I\'m using XAMPP 1.7.2, but need to swap out PHP 5.3 for PHP 5.2 - how do I do this?
Years later, but for what it's worth - This is simple to do.
Just RENAME the C:\xampp directory
Install the desired new version of XAMPP
Simply run the control panel script "xampp-control.exe" directly from within the xampp folder. (Ignore warnings about "must run from C:\xampp - those have nothing to do with multiple installations.)
To switch between these versions of XAMPP, just rename the xampp directories as necessary, and re-run.