try $findfile or even the new fopen commands might be a way to go. i dont know of any other metthod for u to get this other than using moo.dll which does have the ability to get pagefile info. its done like this
$dll($scriptdirfsmem.dll,GetMemInfo,totalpagefile)
returns the total page file and like this to get free page file info
$dll($scriptdirfsmem.dll,GetMemInfo,freepagefile)
u can then do a $calc to figure out the usage between them altho thats the only method i know of returning the value im sure there are others