WPD code hasn't been updated in many years, and there was an issue with
document permissions in 5.0. We'll need to replace nsIWBP in Electron,
but this will do for now.
Attachments are opened using file:// URIs instead of
zotero://attachment, which is what Standalone does anyway. Ancient HTML
annotations and highlights won't be displayed anymore, but I'm not sure
they worked anyway, and it hasn't been possible to create them in years.
We might be able to write out existing annotations to notes.
iframes are skipped during saving, in an attempt to reduce the number of
junk ad files. JS can still cause problems with viewing, so we might
still want to either disable scripts or force the viewed page offline
(if such a thing is possible).
There might be issues with auxiliary filename length/characters during
cross-platform file syncing. (We modified the WPD code to shorten/clean
them.)
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