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after searching all THE INTERNET FOR A SOLUTION I DIDNT FIND ANY.
here is one that i invented :
 
Concept:
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1- create a vhd file using disk management. we will call that vhd a black hole vhd.
2- use robocopy to move the entire long path folder to the black hole
3- delete the black hole
 
Steps:
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1- right click my computer
2- choose manage
3- select disk management
4- from "more actions" menu on the right
5- choose create vhd and put it anywhere
6- go down to the disk and right click and choose initialize then format
6- use robocopy with the /move switch
  example : robocopy C:\users\[userx]\AppData  H:\blackhole.vhd /s /move
7- after robocopy completes
8- goto disk management
9-right click the disk and choose detach vhd
10- goto the vhd and delete it