I just tried to open a DICOM MR image with the windows installer posted here (https://camic-dkfz.slack.com/archives/C0110LS9ADA/p1612512246049700) but there is no reader found. It works fine with the MITK Workbench v2018.04.2.
Test Data: {F2093125} (Rename to have an 'ä' in the filename, only fails on Windows)