Have been doing some testing with the latest Kontakt 5, and although the website only mentions its use with Windows 7 I have not yet found any problems using it with various versions of XP. (After all it is an update of Kontakt 4 where XP was supported)

Due the comprehensive capabilities of Kontakt 5 I have not been able to try everything; however it should be fine for arranger users as most are not into really in depth programming of sounds.

NOTE: As far as I am aware NI will not provide support for Kontakt 5 on XP or Vista, however there should be plenty of support on the NI forums.

Bill