Weird. there might be a simpler fix but if you never clean installed Windows 10 yet i would do that first and see if the problem goes away as something might be out of whack on your computer which is why if someone has not clean install Windows there might be a chance random crap could turn up. at least if you did a clean install then you could be sure Windows is in good running order.
also, so you are telling me this happens even with shorter file names etc?
like say for example C:\test folder\filenamehere.jpg ; like when copying something like that to a external drive it will act up? ; i just wonder when it complains about 'file is too long' if that whole 260 characters thing is a issue.
but come to think of it... this might not help but it's still probably a good idea to do anyways is to make sure everything is intact on Windows 10 (assuming you got that on your computer?)... right click the start icon in bottom left area of screen and then select 'Command Prompt (Admin)' and after that loads up type in... 'sfc /scannow' (without the ') and hit enter and let Windows 10 check the integrity of the OS etc. it will take a little while to finish (maybe something like 5-10 minutes or so) but i just want to make sure that part is okay to make sure your core OS stuff is not corrupted etc.
if everything from that scan turns out okay you should see a message saying, "Windows Resource Protection did not find any integrity violations."
p.s. side note: they must have just released build 14393.222 for Windows 10 as i got the update a bit earlier. not that this matters for your particular issue though.
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