HTC with WM7: Contacts ringtone issue

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Hi All,

I have HTC HD2 with WM7 OS.
I try to set different ring tone on my contacts.
I go to People-->I select my contact-->Edit-->ringtone
the system shows me it's own default ringtones only.

I have put my ringtones (*.mp3, *.wma with duration less than 30sec) into
Windows folder (the location of default ringtones) even into my storage card/my documents/my ringtones, but on ring tone selection I cannot see any of them.

Does anyone configure it?

BR
Harry