One option is to use:
1) my DecodeCCF program to decode the old CCF file
2) Excel or similar program to read and sort DecodeCCF output into an easier to use sequence.
3) my MakeHex program once for each set of protocol/device from the decodes to recreate clean Pronto Hex in the form the MX-850 software considers "learned".
4) Irpanels.exe to convert MakeHex output to CCF files with numbered buttons
5) Universal browser to read those CCF files, then manually consult the sorted list in Excel to see which numbered buttons to drag to which named functions of the MX-850

DecodeCCF, MakeHex and IrPanels are all free downloads discussed in other threads in this and other RC forums. Excel is convenient for this task, but not required.