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When I try to install, it is asking what program to use to open 'Firefox%20setup%204.0.0[1].exe'

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When I try to run the download, I get a "Open with" window and it is asking me to choose the program I want to use to open the 'Firefox%20setup%204.0.0[1].exe' file.

When I try to run the download, I get a "Open with" window and it is asking me to choose the program I want to use to open the 'Firefox%20setup%204.0.0[1].exe' file.

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You can save the file to the desktop and start the installation with a double click on that desktop icon.