I'm not the best person to answer, as although I have programmed in Pascal a decade ago, I also never really fiddled with anything outside school. I do have a interest in the language, given it tends to be as fast as C, has object orientation and other goodies, and seems to be able to compile to just about any architecture with minimal fucking around or code wrangling.

Anyway, according to the Freepascal wiki, "The compiled file is called .bpl in Delphi. This is effectively a (special) DLL. In other words its linking is finalized. The needed metadata (.ppu, inline function and weak packaged units (see next point) go into a .dcp file."

According to Embarcadero Delphi's help page, the .bpl is a binary file built from source, so it's probably not a simple matter of just telling Lazarus or Delphi to open it.

Maybe, and this is me being hopeful, using something like this, IDR, will make things simple and straightforward.