When working with Trados Studio not all file types can be comfortable previewed with current solutions. And even if the preview would be possible, for many files the pictures enclosed will not be present on the users PC.

Having a PDF would allow the user to scroll to screenshots or other pictures and see the necessary reference.

Example: currently I translate memoQ files for a software, where the GUI will not be localised. So I need to place all menu names in source language in my translation. To do so I have to switch between TS and Acrobat to see the menus. Having the PDF opened in a window within Trados Studio would be really very helpful.