You need to add a manifest to make it compatible. Check out this link:
http://msdn.microsoft.com/en-us/library/bb756929.aspx[
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Although vb6 is one of those languages that shouldn't be used for active development and you should consider replacing it. There is no future for it anymore and will trouble awaits you. So, best thing to do is to add the manifest and then get working on a new version, in vb.net for example.
Good luck!