Problem creating ttx files from pptx files

Hi,

I am using Trados Studio 2014 SP2. My client wants ttx files back, created from the pptx files they sent me.

Now when I create a ttx file using Legit or TTXit! to convert the pptx files to ttx files the file conversion itself is successful (I found out I need Windows administrator rights to do it) but the text in the created file isn't properly converted and has a lot of unreadable characters.

When I check the available file format filters, Studio tells me that there are no filters available for Powerpoint 2007/2013 files. Could this be the cause for the formatting error during conversion, and why are there no Powerpoint 2007/2013 filters?

Anyone any idea?

Any help greatly appreciated,

Jan-Peter