According to information on MikroTik's wiki page, it is not possible to recovery the passwords without loosing configuration, I'm not too sure about that, while the admin have a recent backup of entire mikrotik's system and put it in external storage beside of mikrotik's machine itself.

You can retrieve your forgotten password by this tool, just download-compile and follow the instructions, and the problem solved ;)

By the way, maybe you want to exploring what's inside of Mikrotik-DOM ?, so, place a bootable Backtrack3 Operating System in your optic drive that connected to your PC/machine within DOM inside, they're maybe separate as master and slave (optic drive + DOM), that's no problem, and finally boot it from disc, read your DOM from BT3 at rest. I'm pretty sure that you'd found something useful about Mikrotik by using Bactrack's drive explorer, maybe could be your next invention of your research eh? :D

source : Click here