General Are Windows XP compatible products part of the Microsoft "Designed for Windows XP" logo program? No, compatible means that Theorica Software has tested the applications in the Windows XP environment; Microsoft logo certification is a separate process. Did Theorica Software test all of Windows versions? No, Many of Theorica Software's applications are native 32 bit. and developed under Windows 98 and XP. These are tested with all versions of Windows 98, ME, 2000, XP. What does "XP" means in SafeXP, GameXP etc.? XP is abbreviation of "Extreme Programming" that is a discipline of software development based on values of simplicity, communication, feedback, and courage.