To expand on gingem's explanation... for me it needs to be a font that's not in the c:\windows\fonts folder (otherwise you don't get the Open With selection), and the windows font viewer is c:\windows\system32\fontview.exe
Or go to the windows explorer, open up Tools, Folder Options, File Types. Look up TTF and click on the Advanced button, then click on Open then the button Edit, and add this to the "Application used to perform action:" text box
C:\WINDOWS\System32\fontview.exe %1
Shaddy
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