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Import messages from Icedove to Thunderbird


I've just installed Debian 9 (stretch) and I'm trying to import folder with messages from Icedove 38.5.0 at my old PC (running debian 8) to my new PC with Thunderbird 52.8.0. 

In Icedove I select a folder and Tools -> Import/export in mbox/eml format -> Export folder

And save the file in a pendrive.

In Thunderbird I select Tools -> Import -> Messages -> Mail -> Next

But appear only the message: No application or data file to import

And no option to select the file that contains the contact list as in


Please, any tip?