At work, one of my coworkers was running out of disk space on their computer and someone on my team went to help. I suggested a program called "WizTree" (not an endorsement, just what I use) but they wanted to use "WinDirStat".
Anyway, searching the Microsoft app store for "WinDirStat" popped up TONS of fake/bootleg pieces of software, none of which I would ever trust or install. I tried to explain this, but one of those apps was selected and while it did show what the large files were, I assume we'll have to now run a virus scan on that PC.