Open files
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 When a select Open, in the popup, filetype is set to “All types(.)”. How can I change it with a regulare file extension(.txt,.py, etc)? 
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 There is no way to change the default “filetype” in the Open dialog. If you want to filter by a certain filetype, then you just have to select the “filetype” yourself each time – or type the *.pyin the “file name” box, which will also apply the filter.(On the Save As dialog, it is different, because there’s a setting which will determine whether a normal text file defaults to saving as *.* or *.txt … but that’s only for the Save/SaveAs dialog, not on the Open dialog.) 
