At this point in time, every Windows PC should be capable of handling XML files - yours isn't.
While we do have a "Microsoft Installer" on the COADE website for the "XML Parser", I suggest that a better course of action would be to go directly to Microsoft's website and download the "XML Parser" specific to your operating system. (In the old days, when XP was first released, the parser from Win2000 would work on XP. Now there are revisions to the parser for 2000, XP, and Vista. You need to acquire and install the proper one for your Operating System.)
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Regards,
Richard Ay - Consultant