To me it looks like this ISO has been truncated at 2.2MB, which would be enough to carry the directory structure at the start of the ISO and possibly one or a few small files located near the directory structure data.
Could you try copying the files and folders from the mounted 2.2MB ISO to your PC to see if they copy successfully? If they copy fine, try extracting the contents of the mediactr.cab file using WinRAR and seeing if WinRAR reports an error trying to do so. WinRAR supports Cab archives.
From my experience, files compressed as Cab, Rar, Zip or any other popular file compression tool cannot be compressed any further, so these CAB files inside this ISO file are likely not intact or are just contain null data.