Thanks Mark for your trick, unfortunately I am out of work for 3 weeks (vacations) so I cannot test it. Impossible to instal twice the plugin to test it at home
Patrick also sent me a solution :
"Regarding your problem with 2014 and no suffix. I have tried in on my Mac. The first two items in the drop down file filter on my 2014 version are "All Documents" and "All Readable Documents". If you choose either of these (or FreeHand) the files with no suffix are greyed out. When "FreeHand" or "All Readable Documents" is selected you can't select the files with no suffix. If you select "All Documents", the files are still greyed out but you can select them and open them."
I hope this will also help future users.
I say it again, this plugin is A MUST HAVE !!