How can I get alle files from within random folders with 
some extensions and not all other extensions? 
E.g.:
the root directory is:
mywarehouseserver/temp/
then there is coming a random thing like rad45F4 and then 
the file like whatever.pdf
I only want to get the PDF, DOC, PPT files, but not the 
rest (like EXE, TIF, PM6, etc...)
Can I do something like:

-mywarehouseserver/temp/*/*
+mywarehouseserver/temp/*/*.pdf
+mywarehouseserver/temp/*/*.DOC
+mywarehouseserver/temp/*/*.PPT

Is this a possible way? Is there an other (better) one?
Best regards

Jan