I just recently got the Mass Effect Trilogy for Windows from Amazon.com, however, it was the EU version rather than the US version. Do the trainers for the respective games work on the EU versions, or are they exclusive to the US versions?
Yes. They work with both. Note that you will need either Origin or Steam to run it. There is some issues when using the game through origin but there is work around in the trainer thread.
As far as I am aware the only thing that matters is what build number it is. As stated before. Region doesn't matter.
* Up to 400 new and updated trainers monthly
* Manage and update trainers through one app
* Request which games get new trainers
* Priority support with any problem