How to recover a site using xml.tart.part backup file

Hi.

I have lost two wordpress installs (both messed by hackers I think).

I have a backup for each.

One is a: .xml.tar

The other a: .xml.tar.part

Could you tell me how best to load these from the desktop on my pc, onto two fresh installs? Assuming this can be done?

Thanking you in advance.

Regards
John voce