You need to open the clients machine recent directory
and check all the doc extentions
this can be done via accessing the directories of the lcoal users recent directory.
you can use any of package like TEXT_IO, ole2, webutil etc to access that directory.
You can also access the word application via client_ole2 package of webutil package
for this you need to make the word.application as the object
then access the recentfiles of that object as object
and then get each file in that collection and get the name of each file
thats all the recent files approx 17 files available in the word recent tab.