Changing font name properties

My problem is that when I copied over fonts to the windows fonts and told it to replace the current font it didn't do what I wanted. For example I copied over a font with the name HS.ttf, and when I now look at the corresponding font it is called HS_1.ttf. I have a certain program that looks in the Windows\Fonts folder for a font called HS.ttf and it currently can't find that file.

I thought no big deal I'll just rename HS_1.ttf to HS.ttf. That's where I have a problem, when I try to do that it gives me the error 'Cannot rename HS_1: A file with the name you specified already exists. Specify a different file name.' When I do a search for a file called HS.ttf it can't be found anywhere. How do I go about finding and removing this HS.ttf and renaming my HS_1.ttf file so that my program can correctly find the font file I want it to?

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