Open the DMG File You can open the DMG file by double clicks or Disk Image Mounter feature (from the sub-menu of Open With) in its right-click menu. Or you can use Attach feature of iSunshare BitLocker Genius to access the DMG file. Chrome OS is based on Linux, making it vulnerable for pretty much any attacks that work on Linux computers, though it seems some things are sandboxed more than most other Linux distributions would do (see rakslice's comment). Many things in Chrome OS are done in the browser which makes it more secure, but this still doesn't eliminate all exploits.
In this post, we’ll cover how to run a SSH server directly on Chrome OS (ie not into a Crouton chroot).
Which would be the best OS to run Google Chrome for an old system? Given your specs, and the fact that you want to setup the system for browsing purposes, i suggest you to switch to a linux distro like Puppy Linux, and install Chromium browser (. Right click the system tray icon and then uncheck 'Let Google Chrome run in the background'. Chrome OS is based on some sort of Linux, internally, and it has executable files. However, it won't show them to you, and, more to the point, it will not by default allow the user to download and run.
One of the first things I do on any machine (FreeBSD, Linux, Mac OS X or Windows) is to install, run and configure the SSH server. It’s always convenient to be able to scp from and to a computer, or to log in remotely. Even for workstations.
Chrome OS is a reasonable if minimal standard Linux installation offering access to iptables and sshd (and openvpn by the way), so it’s as easy to run sshd and to allow incoming traffic on port 22.
Setup
1. If it’s not already done, switch your chromebook in developer mode, so you can execute commands as root.
Do a backup of your data, as you’ll wipe your current Chrome OS partitions.
On most recent machines, restart in recovery mode (ESC + REFRESH + POWER), then when it boots, CTRL + D to enter the developer mode.
Hit enter to turn off OS verification. It will then restart. Now and everytime after, you’ll need to do a CTRL + D to boot.
It will then wipe your chromebook and reinstall a fresh Chrome OS version. The process takes 6 to 7 minutes.
Former machines require to use an hardware switch, generally located below the battery. Be gentle with this switch, it breaks easily.
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2. Launch a console with the shorcut ctrl + alt + t, then write shell to open a full bash shell (if the shell command isn’t available, you aren’t in developer mode).
Become root with sudo su.
3. Setup SSH keys :