It’s been a good while since I ###### with windows file system. Perhaps that ‘bin’ is both Read and Write protected for other than the system.
There are Windows users here with more knowledge about it than me.
One thing that happens far too often is the Path gets corrupted even though it looks correct.
I’ve found that simply resetting the Path takes care of it.
Not always but, sometimes the indication is when trying to set/see the 3D model, you get a little Red indicator (meaning bad path/file) - this is in the Footprints Properties panel
Be sure to read the last three posted items in the above post.