QT5 Install fail when specify a long or deep path.

As the length of path limiting on windows host, when specify a long or deep path, QT5 installation will fail.
The installer should show a warning or reject the specified path.
Reproduce:
1.run qt-windows-opensource-5.0.0-msvc2010_32-x86-offline.exe.
2.input a long path like D:\Qt\1111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111 on installation folder dialog.(see attachment 1.png)
3.continue install, please note the error dialog. (see attachment 2.png)