Problem with Physique; "Open Physique File" button grayed out

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Hey there! Recently, I downloaded some files i found in a forum in facepunch containing '.phy' files formats. I easily recognized that they were compatible of being opened in 3ds Max; and that's what i did.
By asking in forums and posting threads, i found that there is a page with contents of instructions relating to Physique file, and to remind all of you, I'm very much 'new' to 3ds Max, and downloaded it to be used as a passage for importing.
An image of the instruction
https://gyazo.com/b46a16a80ff909edbff6999baab32324
So i followed it up; I placed a Box object in the workplace and I chose 'physique' in the modifier lists.
I see these icons now at the button; where the 'Load' and 'Save' physique files are which really puts me ahead.
Unfortunately though, the button seems to be not working, and is grayed out?, I suppose; and can't be pressed at all.
I got the thought that I might have done something wrong, or rather, using it wrong. If it is the case, how would i able to fix this or properly use this?
A GIF of the 'grayed out' buttons being pressed repeatedly
https://gyazo.com/d35e5926a643ad80019ac19a7179592c
Thanks!