qtenv2.bat looks a bit suspicious:
Notice that it is appending two paths, one to the qt binaries folder (which is correct), the other one is to a "\bin" folder. I suspect that part should refer to the mingw tools path.
The consequence is that the "Qt 5.7 for Desktop (MinGW)" shortcut that is supposed to launch a command line shell with the environment ready for compiling Qt applications, will now launch a command line shell with an incomplete environment for compiling Qt applications (its missing the environment for the compiler etc).
For experienced users this should not be a big hurdle, but for newcomers for Qt this might be a problem and does not exactly contribute to "love at first sight".