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Yes, tested and confirmed. Here's the procedure I performed:
01. Clone fedora-24-minimal to fedora-24-okular.
02. Install Okular (and some other productivity programs) in
fedora-24-okular.
03. In dom0: $ qvm-create-default-dvm fedora-24-okular
04. Create a PDF in fedora-24-okular.
05. Double-click on the PDF in Nautilus. It opens in Evince by default,
as expected.
06. Right-click on the PDF in Nautilus. In Properties, set Okular as the
default application.
07. Close the PDF and double-click it in Nautilus again. It opens in
Okular this time, as expected.
08. In fedora-24-okular: $ > .qubes-dispvm-customized
09. Shut down fedora-24-okular.
10. In dom0: $ qvm-create-default-dvm fedora-24-okular
11. Start a new DispVM.
12. Create a PDF in the new DispVM.
13. Double-click on the new PDF in Nautilus.
14. It opens in Okular, as expected.
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=Chom
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