Having opened the file chooser dialog in IE,
self.webDiver.switch_to_alert().accept()
Tried the above line but does not click the open button.
IE Version 11.2580.14393.0;
Windows Server 2016 Standard
The dialog that gets displayed is "Choose File to Upload", this dialog has a File name text box with a Combobox + Open button as well as an Open button that is a SplitButtonControl with options to Open/Open readonly or save as previous version.