2636752 - WebGUI File Browser: How to download files to C:\ instead of Z:\

You are saving file to native/local file system using WebGUI File Browser. The behavior is different when executing the same upload/download via SAP GUI for Windows (e.g, using CL_GUI_FRONTEND_SERVICES=>DIRECTORY_BROWSE method). 
During the download in SAP GUI for HTML (Webgui) only Z: drive is available and it is not possible to change this path and save the file on the local drive like "C:".
This is also explained in KBA 2547717 (ITS Up/Down: Only Z: drive available, no local drives (like C:)).

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