I'd like to add a shortcut on Android 4.2.1 to a local pptx file.
Is that possible ?
It's a shame that this isn't built into Android. Fortuantely, there are now many apps that can do that (mostly a side functionality of file manager apps).
If you just need a lightweight standalone app for this, I can recommend File Shortcut.
In fact it's easy to do using a file explorer application.