If you only want to sort by file type, I'd recommend just using Clean Installer. After deleting your duplicates (as mentioned), click on "Type" to sort them by type. Once sorted, click on the first of the file type, Clothing for example. Scroll down to the end of the list of Clothing, hold down the ctrl key, and click on the last one. This selects all the items in between, which should all be clothing if you sorted them. Right click, select Move To, and proceed with moving. Do this for each file type, move them to subfolders, saved sims folders, wherever you like. Poof, done.
I did it this way, and had all 10,000+ of my downloads sorted in about ten minutes. Of course, this was before I found out you can't put clothing and genetics into subfolders.
But another couple of minutes to move them out of the subfolders, and everything's working fine.
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