cmake-gui: Binary path first character is automatically made lower case

Windows 10 1703 CMake 3.9.3 (also occurs in 3.7.2)

When I go type in a binary path, the first letter of a folder name is automatically made lower case incorrectly (I type P, it switches it to p).

The result is C:/d/pB-x86 when it should be C:/d/PB-x86

Interestingly enough, if I make my folder name C:/d/pB-x86/Asdf it does not change it to C:/d/PB-x86/asdf but rather keeps it as originally typed.

Pasting in the desired path also results in the same case changing behaviour.

Other folders currently in C:/d/ are C:\d\Windows-universal-samples C:\d\Hololens C:\d\PB-x64 C:\d\PLTools C:\d\PlusBuild C:\d\Slicer4

and

C:\d\Slicer4_Release_LaunchVisualStudio.bat C:\d\Plus_Build_Debug.bat C:\d\Plus_Build_Release.bat C:\d\Plus_Pull_All.bat C:\d\Plus_x64_Build_Debug.bat C:\d\Plus_x64_Build_Release.bat C:\d\Slicer4_Debug_1CMake.bat C:\d\Slicer4_Debug_2Build.bat C:\d\Slicer4_Debug_LaunchVisualStudio.bat C:\d\Slicer4_Release_1CMake.bat C:\d\Slicer4_Release_2Build.bat