Used avast 2014, it never detected libfreetype-6.dll as virus. Upgraded it to the latest version, avast 2015 and after that when I started mana world, it showed me, that the dll has virus and autodeleted it.

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Here what I done to make mana world work :
Open avast.
Go to settings > Active Protection and then turn off "File System Shield".
Reinstall ManaPlus.
After that go to Settings > Active Protection and click on File System Shield 'customize' link.
Click on exclusions, click on add and type this on the field without quotes
"C:\Program Files (x86)\The Mana World\libfreetype-6.dll" [for windows 64 bit]
or
"C:\Program Files\The Mana World\libfreetype-6.dll" [for windows 32 bit].
Now click OK.
Be sure to reactivate the "File System Shield"
Start ManaPlus.
Now ManaPlus works.
