Help: dmg.1, dmg.2 etc problem joining

I have 4 files that are:

name.dmg.1
name.dmg.2
name.dmg.3
name.dmg.4

I have tried Split & Concat, Stuffitt, using the Terminal, and a number of other apps to join the files but not succefull yet.

Any ideas?

Thanks in advance

[hayne]

Where did these files come from? What is on them?
Didn't the creator of these files tell you how to use them?
Usually you just double-click on the first of the sequence and it automatically loads the others and mounts the reassembled DMG.