it is odd. recently i have downloaded darthmod/radious/third age and just installed diablo3 np.
also running skyrim with around 35 mods no problem.
i re-downloaded again and its given me an exe but no installer icon...i double click and it wants to find a program to run it.
have an uptodate vista64 and havent to my knowledge done something odd. i had a few mods not work before but that was my error and got them working in the end.
beats me
i'll post a pic of how the file looks..(will check its properties as well and post back with some more info).
http://postimage.org/image/bdcsphv6d/