It might be possible to load up CADRG images to MapInfo, and save or export them to MapInfo Interchange format (MID).
Convert Compressed ARC Raster Graphic file to MapInfo interchange format file.
We found one software available in the database for this conversion.
Microsoft Windows software - convert cadrg to mid on Windows
A mapping application for Microsoft Windows
Convert from cadrg file format
The table with program actions contains information about what each program is capable of doing with their files. This may be a good pointer for further searches for certain file conversions and help you find the converter you are looking for if our search result is insufficient for you. However, it is far from perfect and may sometimes show results which are not really usable because of the nature of the software handles the files. So a conversion that appears as possible, just because of matched actions, may in fact not be possible.