I noticed something interesting when playing with this problem. I have a directory filled with *.TXT files.
I shortened one file extension to TX and lengthened one to TXTEST. If I do a search in files named *.TX it only looks in that one file
, it doesn't touch the TXT files.
If I do a search in *.TXT, it searches all the*.TXT files as well as the *.TXTEST file. If I search files *.TXTE it searches NOTHING, not even *.TXTEST. If I search for *.TXTE* it will then search *.TXTEST.
It appears that only if you are searching for a 3 letter extension will it extend the search reach to include all files with extensions that start with these 3 letters; perhaps related to the old DOS rule of extension max 3 letters?
Anyway, you could use this to your advantage -for example temporarily name the *.SAS file to *.SA using Bulk Rename Utility http://www.bulkrenameutility.co.uk/Main_Intro.php
or something similar and do the searches, then rename them back.
Worth a try,