[Ernesto]

I would love if you can add an extention selector, in each box in which a filename should be written. In this way, we could see which is the current extention, and can change it is case it is needed, but we will avoid errors because of forgetting to write the extention after the file name!
The selector will force to be set to one of the available formats, so there will not be any risk of error file writing for this reason!

Ernesto