$ "C:/MinGW/msys/1.0/bin/dir.EXE" asdf
"C:/MinGW/msys/1.0/bin/dir.EXE": asdf: No such file or directory

$ "C:\MinGW/msys/1.0/bin\dir.EXE" asdf
"C:/MinGW/msys/1.0/bin/dir.EXE": asdf: No such file or directory

$ C:\MinGW/msys/1.0/bin\dir.EXE asdf
/usr/bin/dir: asdf: No such file or directory

$ C:\MinGW/msys/1.0/bin\dir.EXE\$HOME asdf
The directory name is invalid.

$ C:\MinGW/msys/1.0/bin\dir.EXE\blah.exe
The directory name is invalid.