I've a couple of files which miss the file extension.
Is DO able to bulk-rename theses by selection, so that all selected files can be renamed (giving them a proper extension).
In my situation, perfect solution would be to have an entry in the context menu -> rename selected files (or something). In this, example (see attached screenshot), I would like all selected files to be given the extension .pdf
Note: In this example only a couple of files but in the real situation ts couple of hundred files.
Hope it's clear what I mean 
Thanks,
Mathijs
