I suspect this is a finicky configuration issue that I'm getting wrong with Document Type / UTI declarations in my Info.plist, but have tried several things and
clipboard.js
ruby-on-rails-3
signtool
parse-dashboard
dynamics-ax-2012
pypandoc
user-inactivity
dse
anpr
maildir
kolmogorov-smirnov
iaccessible
file-system-access-api
visual-programming
android-jodatime
curlpp
instantsearch
serve
multipeer-connectivity
px4
dism
winappdriver
interlocked
pip-tools
documentation-generation
appcompatdelegate
windows-8
jest-preset-angular
rapid-prototyping
solarwindslem