The first thing is see if in this file is opera instead of microb. Menu->Utilities-> X Terminal
In xterm write "cat /home/user/.browser | grep engine" (without " ") and press enter.
If the output is engine=opera, then go to change this.

You need a real text editor for change this (Notes isn't a real editor). There isn't a editor for OS2008 easily installable yet (I think). If you know as become root, you can install nano as root user or red-pill mode. Search the correct repository in http://www.gronmayer.com/it/
Then run nano with "nano -m .browser". Change the engine part. Tap in WriteOut and enter for save the file. And exit with the Exit menu in nano.

Easy way:
Download the file attached to Documents directory, and with Xterminal:
First "cp /home/user/.browser /home/user/.browser.old"
and then "cp /home/user/MyDocs/.documents/browser.txt /home/user/.browser"
Browser must be closed before.
Test the browser.

The .browser file is a configuration file. It has the main configuration options for the browser.

I hope that you can understand me