This is one of the efforts to reduce usage of `ShellExecuteByExplorer`
(bug 1620335).
The purpose of using `ShellExecuteByExplorer` in the scenario to open a
downloaded file is to support applications which are not compatible with
the mitigation policies of our process. When a downloaded file is an
executable, however, we prefer security to compatibility and in particular
we want to prevent binary planting on a user's download directory.
The proposed fix is to go to `ShellExecuteExW` straight if the target
file to launch is an executable.
Differential Revision: https://phabricator.services.mozilla.com/D66325
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