> > Hi everyone
> >
> > I manage a lot of PDF files and I'm accustomed to viewing them by
> > simply pressing 'O' for open in Ztree. Recently, I've found this
> > doesn't work any longer. I'm using the latest Zeta version 2.4.211
> but
> > the problem exists in my registered version too, which is 2.2.1
> >
> > What seems to happen is an instance of Acrobat opens, as I can see in
> > the task manager, but the file name/location does not seem to be
> passed.
> >
> > Has anyone else experienced this? I appreciate that this may not be
> > simply a Ztree problem and may well be a Windows 11 issue.
> >
> > Any help greatly appreciated.
> >
> > Best wishes
> >
> > Alan Clark
>
> Works fine here.
>
> Suggestion : right-click on any PDF file | Properties | Modify to
> reassign Acrobat as default.
>
>
> Alternatively, I suggest the following:
>
> Download and install SumatraPDF
> https://www.sumatrapdfreader.org/download-free-pdf-viewer
> At installation time, click Options | Let Windows show previews of PDF
> documents
> Once installed, make SumatraPDF default (same way as above for
> Acrobat), THEN change it again back to Acrobat.
>
> What it does:
> 1. Changing pdf reader for alternative ones sometimes "fixes" lost of
> right association
> 2. Bonus, now pdf thumbnails are shown with content at very fast speed
> in Explorer, things to Sumatra. ;-)
>
> If nothing works, try uninstall/reinstall Acrobat itself.
> You could also "clean" bad Acrobat registry entries and files before
> reinstalling with Adobe Cleaner Tool
> https://helpx.adobe.com/creative-cloud/k...eaner-tool-installation-problems.html

Hi Laurent

Acrobat was my default app for PDF. I did as you suggested and installed Sumatra and it worked fine, but I changed the default back to Acrobat following John's advice below and now it's working fine.

Thanks for your help.
Alan