From Scriptwiki
Returns path with the filename stripped.
$nofile(<path/filename>)
Examples
$nofile(c:\mirc\mirc.exe) returns c:\mirc\
$nofile(c:\mirc\) returns c:\mirc\
$nofile(\mirc\mirc.exe) returns \mirc\
$nofile(c:\mirc) returns c:\
$nofile(mirc.exe) returns null.