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[Akshay Shekher <voldyman666@xxxxxxxxx>]

The earlier implementation IIRC worked in the following way.

App -> contractor [give me a list if programs that handle file type x]

<- [program a b ... ..]

App asks the user to select one or selects one itself and

App -> Contractor [program Id x, for file/uri y]

<-  [command string]

App executes this using execv or something similar.

The '->' is for dbus function calls and '<-' for return.
Dbus is just a protocol for doing interprocess communication so a
program/script can use contractor if it can use dbus.