I know this is an old thread, but a google search sent me here after I experienced a similar problem with my A500 running KS2.05+WB2.1.
The solution is to:
* Install aguide34.lha from aminet.
* Install 2b_mv_os2.lha and 2b_mv_prefs.lha from aminet.
* Navigate to SYS:Utilities and left-click the MultiView icon, then right click and select Icons->Information from the menu. This brings up the Information window.
* The "Tool Types" box is where the MultiView config details are kept. Click "New" and enter "DEFAULT=SYS:Utilities/AmigaGuide" (without quotes) in the box and click "Save".
* MultiView should now correctly display AmigaGuide and text files.
It appears MutliView defaults to using AmigaGuide, but maybe it's looking for a newer version (like paul1981 hinted at) so it fails. By defining DEFAULT to use our installed AmigaGuide, things start to work.
By the way, I was using a fresh install of WB2.1 (from original disks) and it didn't contain AmigaGuide. I had to install it from aminet. That wikipedia article linked above is either incorrect or there are different "versions" of WB2.1 out there.
Thank You! Had same struggle. Now my AmigaOS 2.04 finally has MultiView
