What is this broken start menu item?

I have this start menu item. But I do not have the associated program on my pc anymore.

I do have this at: C:Users%username%AppDataLocalPackagesMicrosoft.Windows.Search_cw5n1h2txyewyLocalStateAppIconCache100C__Programs_PolyMC_polymc_exe which is a “file”

And when I look for it: this is what I see in the Resource Monitor