Open DICOM dialog File Preview:  In Build 137, a defect became apparent when the preview of the DICOM file was all "white".  This is an "uninitialized memory type of error" and might have been presented differently on different systems.

Fixed the problem loading with the DICOM single file provided by Riccardo Lattanzi.
This is unconventional DICOM obtained as a result of image processing

Save RAW dialog box:  added a "state variable" so the last used extension is remembered and offered as a default choice next time when the dialog is opened.

Open RAW dialog box:  added a "state variable" so the last used extension is remembered and offered as a default choice next time when the dialog is opened.