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How can I add a folder on a network drive (like \\TUS-SV-FS\fs\) to the system path? It looks neither sys_path nor file_add_path can do this.

I have PT_Fast.plb located in a folder on a network drive \\TU-SV_FS1\fs\aero\Tools\PCL_RFast.
 
dump file_add_path(0,"\\TU-SV_FS1\fs\aero\Tools\PCL_RFast")
$# INTEGER = 0
dump file_exists("PT_Fast.plb ","P")
$# LOGICAL = FALSE
 
I know mapping the network path onto a local  disk helps, but I need a workaround without mapping.