[X4U] Acrobat Annoyances - Multiple "open with" entries.

[Stroller]

On both my Macs when I right-click on a PDF and go to the "open with" 
section I get multiple entries for Adobe's Acrobat apps, as shown in 
<http://mac.stroller.uk.eu.org/PDF%20Problem.png>.

Is it just me that gets this, or have other list members experienced 
it, too?
The screenshot is from my PowerMac - my laptop has two entries in each 
case. My laptop is much newer than my desktop computer, and it feels 
instinctively like this is related to Adobe's automatic updates 
feature. Anyone?

Stroller.