Solidworks File Name Code?

Hello all,

I'm wondering if anyone knows what the file name code is for having Solidworks read a file name and enter it into the properties table of a part file or assembly file. See my attached image for what I'm trying to do. Right now, the red arrow is showing you where I entered the part number (file name) manually. What I want to do is have a line of code that always pulls the file name and dumps it in that spot.

You can also see that I've opened the dropdown menu and there is no option for file name. I tried the same line of code that populates a title block with the file name of a model, but that code does not work in the properties table.