Thank you. It is good to know it. Anyway I think that a more elegant way of do it should be implemented ingame or, at least, have a more descriptive tooltip when hovering the mouse over the game list.

<t> When trying to join a PBEM match that is created in other language it appears in red and a message says that the match is using a modified data file.<br/>
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Tested when trying to join a match created with an installation in Spanish while I was using an installation in English. Solved ...