Ok guys, if you have a reason to rename accounts here is what you have to do:
Account file is stored like this:
Account name: test
ascii(t) . ascii(e) . ascii(s) . ascii(t) = 188.8.131.52.acl
To find the folder you have to do:
((116 ^ 2) + (101 ^ 2) + (115 ^ 2) + (116 ^ 2)) modulo 1000 = 338
So this account file would be stored in c:\account\338\184.108.40.206.acl ( or wherever you placed your account folder)
a) Now make a backup of this file and rename it accordingly.
b) Solve the exponation equation i described and copy the file to the folder number you got by solving equation.