Unless you only use the viewer to view PDFs, of course. 
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unless you only use the viewer to view PDFs, and you have Adobe Reader installed.
not a good choice if you have Adobe Acrobat 9 installed, in that case it will take forever to view PDFs using opus viewer.
Opus is a great program by the way, don't know how i would use my computer without it!
You can have both Adobe Acrobat and Adobe Reader installed on the same machine if you want both. Whichever was installed last should be what the Opus viewer panel (and Internet Explorer) uses to view PDFs.
(Or Acrobat and FoxIt etc. if you prefer other PDF readers.)
Is there a way to use google chrome to open pdf's in Opus? Chrome is much faster and it may be IE 7.0 that slows everything down.
Any other ideas on how to make adobe files open more quickly in opus? I don't really want to install both Adobe Acrobat and Adobe Reader on the same machine and then have to battle with which one opens adobe files
As I keep saying, it's probably slow because you're using the full Acrobat to view PDF files. If you want it to be faster you should set a different, lightweight program as the PDF handler. There's probably no way around that.
I'm pretty sure Chrome doesn't have its own PDF handling so it would still use the same thing as IE7 (i.e. Acrobat if that's what's installed as the PDF viewer) if it even supports inline PDF viewing. IE7 itself also has very little overhead and is unlikely to be slowing things down (unless the slowness is coming from anti-virus software that's being extra cautious with IE, I guess). Either way, Chrome does not provide an API for other programs to use it like IE does so it's not an option.
You can, however, take IE out of the picture by removing .PDF from the "Internet Explorer" line of Opus's ActiveX plugin's configuration (Settings -> Preferences -> Plugins -> Viewers -> ActiveX + Preview + Office + Web -> Configure). The ActiveX plugin will then call on the installed PDF ActiveX control directly, without using IE as a proxy. (This is because .PDF is also in the "Generic ActiveX" line of the configuration as a fallback.) It probably won't make things much faster, if at all, but you can try it if you want to test whether IE7 is making any difference.
You can also use FoxIt or various other PDF viewers with the ActiveX plugin. They should be used automatically if they have been installed (and nothing else that takes over PDF has been installed after them).
Adobe seem to have explicitly designed Adobe Acrobat and Adobe Reader to co-exists so it seems worth a try at least. If it doesn't work you can always uninstall Adobe Reader but give it a try to see if it works.
Am back to square one. Everything worked for quite a while but now with a new upgrade to Opus Directory 9 (v. 9.5.0.0.3565.x86) the first pdf file opens quickly in opus viewer, then the next file loads very slowly.
I have windows XP, Office 2007 and foxit installed.
I can't think of anything that has changed recently in how Opus displays PDFs which would slow things down.
Did you try the things I suggested in my previous post?
Thanks Leo.
I tried reinstalling Foxit and the same issue occurred. First file opened quickly and the second file opened after 20 seconds. Strangely enough, even though I reinstalled foxit, the adobe 9.0 toolbar still showed in opus.
So now I have uninstalled foxit and installed adobe reader and files open quickly.
I guess that foxit is not compatible with opus. I can't do any work without opus so foxit had to go.
I have used Foxit for years and never had any compatibility problems with Opus. I'm sure many others could say the same. It might be interesting to try one of the other lightweight PDF readers - e.g. PDFXchange or Sumatra - to see if the same thing happens.
Regards, AB
Foxit seems to work fine in Opus for me, though it's not what I use on my main machine.
It sounds like the multiple PDF tools on your machine were getting in each other's way if the Adobe toolbar was appearing when you were expecting Foxit. Possibly Opus was trying to create an instance of one of PDF tools which had to fail to launch before Opus fell back on another PDF tool (which then worked), and sometimes that failure took longer than others... There's a debug version of the ActiveX plugin if you want to see if that is/was happening. (PM me if you want the details.)
Just had to uninstall adobe reader as it lacks the snapshot tool which is in adobe acrobat 9.0 and in Foxit.
I tried reinstalling foxit, but even though foxit is now the default pdf program, it looks like the adobe acrobat 9.0 is loading in opus. So am back to square one with 20 second load times for the second file. The first file loads in less than 1 second when I open opus.
It would be great if Adobe acrobat 9.0 would work with opus just like previous versions did. Everything loaded very fast.
I'm not sure if other light weight pdf readers will have the same functionality as adobe acrobat 9.0 or foxit.
In the ActiveX plugin's config, see if there's an "Adobe PDF for Vista" or similar entry near the top. If there is, try turning it off to see if you then get FoxIt.
Just tried installing pdf xchange viewer and the adobe acrobat 9.0 toolbar still appears in opus. First file fast, second file slow.
Leo and AB,
Thanks for all of your help!
I have installed PDF Xchange Viewer which is a great program, better than foxit, and everything works and is fast.
One step that I did during installation that may have helped 
is that not only did I close Opus, but I also exited Opus in the tray, before I installed PDF Xchange.
Back to a new square one.
Have installed PDF xchange viewer on a new computer and it does not show the xchange toolbar. It says at the top of the pdf view: (PDF-Xchange PDF Preview Provider (XP)).
On the old machine with PDF xchange viewer it says Internet Explorer at the top and also shows all of the xchange toolbar.
I fixed it!
i went in to configure the activex and unchecked pdf view: (PDF-Xchange PDF Preview Provider (XP)) and now it works.