Not work with Vista?

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Whenever i try to run MEF 2.3 in my WoW folder a window pops up and says "Injection Failed." Is that because im running on vista? or is it because i might be running MEF 2.0 instead of 2.3?

[Conflag]

Whenever i try to run MEF 2.3 in my WoW folder a window pops up and says "Injection Failed." Is that because im running on vista? or is it because i might be running MEF 2.0 instead of 2.3?

2.0 would not work.