I want to be able to download a file with a particular extension from the \'net, and have it passed to my application to deal with it, but I haven\'t been able to figure out
Read this
https://developer.android.com/training/sharing/receive
, this could help to get started.
then in the manifest file try the below intent filter when registering receiver in the activity to be opened
make sure that the extension is provided without "." in it