Importing mesh is powered by Assimp. Assimp support many mesh format, nevertheless we recommend .fbx or .obj.
Just set Importer name to OpenAssetImporter and Processor name to ModelProcessor, like below.
<Item Include="\Models\Tank\Tank.fbx">
  <Name>Tank</Name>
  <BuildAction>Compile</BuildAction>
  <Importer Name="OpenAssetImporter" />
  <Processor Name="ModelProcessor">
    <TextureFormat>Compressed</TextureFormat>
  </Processor>
</Item>
Just set Importer name to OpenAssetImporter, Processor name to SkinnedModelProcessor, and StockEffect value to SkinnedEffect, like below.
<Item Include="\Models\Karakter\Karakter.fbx">
  <Name>Karakter</Name>
  <BuildAction>Compile</BuildAction>
  <Importer Name="OpenAssetImporter" />
  <Processor Name="SkinnedModelProcessor">
    <StockEffect>SkinnedEffect</StockEffect>
    <TextureFormat>Compressed</TextureFormat>
  </Processor>
</Item>
Defaultly, TextureFormat is Compressed for best performance when rendering. You can create custom Importer library .dll to support other mesh format.