iMOD map files can be grouped into a Multi Data File (MDF) which contains the references to all grouped IDF-files. The MDF-file helps to control the number of files in the iMOD Manager.
The MDF-file is saved in ASCII-format and it has a logical structure. However it is not advised to change this file outside iMOD.
The content of the MDF-file can be displayed by the option Info on the Map Info window