does anyone knows what is this file SULFNBK.EXE (WINDOWS) for?

From MS site:


Sulfnbk.exe is a Windows utility that is used to restore long file names. This utility is not required to run Windows, but it is necessary if you need to restore long files names if they become damaged or corrupted.


See more at:
http://support.microsoft.com/support/kb/articles/Q301/3/16.ASP?LN=EN-US&SD=gn&FR=0&qry=SULFNBK.EXE%20&rnk=1&src=DHCS_MSPSS_gn_SRCH&SPR=W98