Actually the best solution would be to use a windows server.
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Hehe, so I will come back to the discussion as well. And have to ask why? Apache/linux support php fine, and as prevously stated, if one only wants a library to get the mul files on linux, there are plenty out there. We have assumed the user wants to use C#, but that isn't clear. Nor is it clear that would buy any major advantage in this instance (over Java, php native, or use C/C++ and other mul libraries).
And the suggestion wont work, unless the dll is modified, as it has been identified to have native windows calls that do need to be changed (few, but there are some). So if one wants to get that route, then changes have to be made to the dll, and then it can be tried.