Cimrex Prog 4.01 does not support the Cimrex 71. It is being replaced with the Cimrex 67 and 69.  To open and convert a Cimrex 71 program you will have to install a Key.  The folder 
"cd:\Bin\Cimrex Prog 4.x Cimrex 71 Key" contains the key. 

To install the key:

Copy the software key to your hard disk
Close Cimrex Prog
Run C71.reg
Start Cimrex Prog
The Cimrex 71 is now in the selection list