Does anyone know how to load the new proprietary MRR files using QGIS or GDAL?
I tried using Add Vector Layer but QGIS did not recognize this file.
.mrr is the MapInfo Multi Resolution Raster and you need MapInfo Pro to be able to create these. It's an additional specific licence over the normal software (usually).
In QGIS you will also have the same issue with there new extended tab format - you need 64bit MapInfo.
It's basically their version of the OGR VRT format.