Ok this did not work the way I expected. I thought it would reset the default of saving to C drive "Documents" to now save to the D Drive.
What it actually did was just duplicate the folder and continue to save in both locations.
The game still saved to the C drive every time, but also copied those same files to the D drive. If I delete the C Drive files, thinking they are a duplicate and I can use the D drive files, nope, the D Drive files are gone too. All the homepath command did was create an exact working copy of the C Drive folder.
@jlstrotman The files you're seeing on C aren't actually on C. You're clicking through the symbolic link and landing in D, to where you redirected your Sims 4 folder. That's why deleting them in one place removes them from the other: there's only one set of files, which you can access two ways. If you're not sure about this, right-click on the Sims 4 alias on your C drive and select Properties. You'll see the file size is tiny compared to the full folder on D.
Mklink helps
