[Ham-Computers] File problem with IE8

[WA5CAB at cs.com]

I recently converted from IE7 to IE8 on one of our workstations by 
installing 8 over 7.  Virtually nothing looks different and in general I see no 
performance changes (neither faster nor slower).  However, the way in which 8 
handles opening files on websites is totally different.  Specifically DOC, 
JPG, PDF, TXT and XLS.  Under 7, when I clicked or double-clicked (as 
appropriate) on a file, IE apparently called the associated viewer of record to open 
the file.  8 on the other hand seems to open the file itself and does a PP 
job of it.  No paging forward or back.  No zoom or fit to page capability.  
And you don't close the file when done, you have to remember to hit the Back 
button.  Etc.  Does anyone know whether there is a way in which to force it 
back to the previous response (i.e., use the program that presumably knows 
how to properly open the file type)?  I have looked but cannot find anything 
that pertains to file types except 

Robert Downs - Houston
wa5cab dot com (Web Store)
MVPA 9480