From what I can tell the Ubuntu flavor of Linux, which I'm using, does support the use of 32bit binaries on a 64bit machine. I don't have a 64bit computer running Linux but most of the software, including a good bit that is packaged into the OS, running on my 64bit Windows computers consists of 32bit binaries. However, when it is possible to run 32bit binaries on a 64bit machine but not the other way around it would seem that the 32bit package is the more universal solution. In the case of commercial use please take a look at the product licences (especially MySQL), from the XAMPP point of view commercial use is also free.There is plenty of sympathy for the developers desire to eliminate unnecessary distributions. Please check every single licence of the contained products to get an overview of what is, and what isn't, allowed. But it is only the compilation of XAMPP that is published under GPL.

XAMPP is a compilation of free software (comparable to a Linux distribution), it's free of charge and it's free to copy under the terms of the GNU General Public Licence. There are currently distributions for Windows, Linux, and OS X.

In the case of commercial use please take a look at the product licenses, from the XAMPP point of view commercial use is also free. To make it convenient for developers, XAMPP is configured with all features turned on.

The goal of XAMPP is to build an easy to install distribution for developers to get into the world of Apache. The XAMPP open source package has been set up to be incredibly easy to install and to use.

Xampp 32 bit download