idpr and dpr conversion

Hi folks, it's my first time posting on the forum.

I am looking for a way to convert idpr and dpr files into a more conventional format (preferably shapefiles or dgn). I haven't come across any converter or a way to access idpr or dpr files.

I also looked up idprcnv.exe too, but so far even that is hard to come by. 

If there is a way, please let me know.

Thank you,

J