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Environment is Windows7 64bit.
After I installed Docker by using Docker Toolbox, I got an error "bash.exe is missing" by clicking Docker Quickstart Terminal.

There are so many solutions at issues on GitHub page, but that solutions seems to be difffrent according to circumstances.
Tentatively in my circumstances, I change the target of Docker Quickstart Terminal shortcut like followings(Add (x86) ).
Finally solved.

Before:
"C:\Program Files\Git\bin\bash.exe" --login -i "C:\Program Files\Docker Toolbox\start.sh"

After:
"C:\Program Files (x86)\Git\bin\bash.exe" --login -i "C:\Program Files\Docker Toolbox\start.sh"

Reffrence:
https://github.com/docker/toolbox/issues/335