Hi,
I'm a php programmer. I'll explain why a 64bit version of xampp would be needed. 32-bit version of PHP has problems with some features. An example is the timestamp command. In the 32 bit version, the timestamp does not recognize the dates above 01/19/2038 while in the 64 bit version this problem does not exist. I hope that a Xampp 64 bit version will soon be released.