, Ajeya wrote

Please guide me where to download software for windows 8 mobile app developement on 

windows XP...Or what are the softwares required for that

just one thing:   by "Windows 8 mobile app" to you mean a "mobile app" on windows 8 or a windows 8 phone app ??

given that in the past MS used the word "mobile" for the phones and also used to refer to CE but now we have windows 8 the phone and windows 8 the desktop and windows 8 the tablet ....

much possible confusion here ...