filename / location for tsukusi a round gothic

Hi there - I've made use of the Tsukushi A Round Gothic typeface in a Axure RP8 mockup - quite extensive use actually ⚠

Of course, this is a system font and I realise that there's no way I can simply share it online but I'd like to base64 encode the font to include it in the Axure file for rendering visually to a couple of colleagues who work on PC over our internal network.

However, try as I might, I can't seem to find the font in any of the usual places... (/Library/Fonts, /System/Library/fonts, ~/Library/Fonts) - does anybody have any idea where I can find the font? (or what its filename is so I can search for it?)