this info is from Xampp readme file

ApacheFriends XAMPP (basic package) version 1.4.12

+ Apache 2.0.53
+ MySQL 4.1.9
+ PHP 5.0.3 + PHP 4.3.10 + PEAR
+ eAccelerator 0.9.2a
+ PHP-Switch win32 1.0 (von Apachefriends, man nehme die "php-switch.bat")
+ XAMPP Control Version 1.0
+ XAMPP Security 1.0
+ SQLite 2.8.15
+ OpenSSL 0.9.7e
+ PHPMyAdmin 2.6.1
+ ADODB 4.60
+ Mercury Mail Transport System for Win32 and NetWare Systems v4.01a
+ FileZilla FTP Server 0.9.4e
+ Webalizer 2.01-10
+ Zend Optimizer 2.5.7

* System Requirements:

+ 64 MB RAM (recommended)
+ 115 MB free Fixed Disk
+ Windows 98, ME, XP Home
+ Windows NT, 2000, XP Professional (Recommended)