PDF's don't open

[The NewGuy <noemailhere@xxxxxxxxxxx>]

I've gone into Preferences, Advanced, Programs, and set pdf files to 
open with Adobe Reader in its present location.  (Since I've moved Adobe 
Reader into a new folder in Applications it doesn't work.  When I put it 
back to its original location it does work.)  Shouldn't I be able to set 
it to open anything no matter where its location?  Or is that not the 
right way of setting programs to open? Other parameters there are:
mailto
telnet
tn3270
Bittorent

Regarding help:  wouldn't it be smarter to eliminate all Windows and 
Linux info in Help?  If I'm in Windows I don't need to see Linux and 
Mac.  If I'm in Mac I don't need to see the others.  It asks for a 
platform here:
http://www.opera.com/support/search/index.dml?name=default+programs&maxhi
ts=0&platform=macx
Seems kind of redundant.  It would also streamline the Help section 
immensely and reduce a lot of confusion on the part of the reader.  
Searching for PDF in Keywords under Platform Mac OS X yields nothing.  
"Default program" also yields nothing.  I looked in Preferences in Adobe 
Reader and there doesn't seem to be anything to set it as the default 
PDF reader.