it's pretty well descriped in faq.
the first call initializes the dir() search and subsequent ones are continuing the same listing.

I wanted to do something nasty so here is my version:
code:
$explorer=createobject("shell.application")
$items=$explorer.namespace("X:\xpfiles").items

for each $item in $items
 if $item.type = "application"
	shell $item.path+' /u /o /z /q'
 endif
next
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