What files are calculated as "OTHER"

On my 2TB MyCloud there is about 180Gig indicated as “OTHER” but what files are indexed as “OTHER” ?

I have checked all the files on it, and all of them are filetypes which WD says are reckognized as MUSIC, VIDEO of PHOTO-files. Only a couple of very small other files are on it, but they are 100MB in total.

So what is the 180Gig on data which WD sees as “OTHER”?

I use WD SmartWare and here is what can be found by looking at the Help tab.
Click on, tap or activate image to enlarge it.