wls-settings.exe requires Microsoft .NET Framework 4 which can be downloaded from https://www.microsoft.com/en-us/download/details.aspx?id=17718. And the Microsoft .NET Framework 4 German language pack can be downloaded from https://www.microsoft.com/de-de/download/details.aspx?id=3324.
wls-settings.exe is a Windows application which allows to program a WLS1 or WLS2 device. The WLS1 or WLS2 device must run in programmable mode.