That file should have all you need, I generated those codes from the Denon documentation. However if you'd like to do it yourself-
Key Title is the function.
C1-C5 is the device code least significant bit first- so using Power On as an example the binary would be 01000(read from right or C5 toC1) which is 8 decimal.
C6-C13 is the function code least significant bit first- so using Power On as an example the binary would be 10110001 which is 177 decimal.
Denon has a tendency to use multiple device numbers for it's products for example the 3910 also has commands that use device code 4 and 6. Each device code would then have 256 possible commands.
I'm in the Mac world, and haven't use MakeHex in a longtime, but in MakeHex you modify the .irp file with a simple text editor and you edit the device= and the function=. The function is a range in the form 0..256.
