What can I use instead of gnome-open?

command-line gnome xdg

You can use xdg-open to open documents, like so:

xdg-open mydoc.pdf

This has a bonus of being desktop agnostic so it should work regardless of what desktop the user has installed. In GNOME itself gnome-open has been replaced by gvfs-open.

References:

  • xdg-open info page on portland.freedesktop.org
  • What is the replacement for gnome-open in GNOME?
  • xdf-open vs. exo-open

You can use gio too. For example gio open notes.doc.

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