HOW TO FIND SOMETHING IN ANOTHER FILE, WITCH IS NOT OPEN?? HELP ME
 

For example.
I have two files: p1.xls and p2.xls
In p1.xls in unknown Cells value = "AAA" or differend string.. and this file
isn't open.

and I would like to write in to the file p2.xls in to ActiveCell something,
but only if i find in file p1.xls value "AAA" .

How to search that file?