That would be great and there may be some. The issue is that there are many different libraries available and it would be hard to match the libraries used by the creator to yours. For example, I have Special Edition and Special Edition Plus, so the ideal files for me would be ones that use those specific samples.
I suppose someone would also have to share the preset or matrix created for the MIDI file, or else the key switches and controllers wouldn't work.
I recommend Special Edition and Special Edition Plus if you are looking for an overal orchestral collection. This has most of the orchestra (string, wind, percussion), lots of orch string articulations and good solo string articulations. (The Appassionata articulations sound good but limited. If I were doing film scores, I would add the full Appassionata library.)
Are you using this as a stand-alone program, or with a DAW (e.g., Sonar, Pro Tools, Cubase, Logic)?