If you download the MS Filter Pack and install it on your indexer (the only place you need it) you’ve still got some registry entries to make/verify. I got tired of doing them by hand so I created a .REG file. You can download my file. Rename it as .REG (I had to change the extension to .TXT to upload it.) Then just double click it. It will make sure the entries are in place. I’d reboot after that just for good measure.