The dpl.pln file is just an internal service file requred for DNS operations in FSX environment.

It's time to clear the DNS concept.
The DNS has been developed as authentic as possible, therefore:

- It is not designed to load any flight plans.

- Using of the DNS control panel is the only way to create valid DNS route.

- Please note DNS route limits are the following:
- AUTO mode - 2 segments (legs)
- MAN mode - 1 segment leg  

We are sorry for the cofussion, the info has been missed from the manuals (to be added in 1.1).