AssetDatabase.LoadAssetAtPath  

static function LoadAssetAtPath (assetPath : String, type : Type) : Object

Description

Returns the first asset object of type type at given path assetPath.

Some asset files may contain multiple objects. (such as a Maya file which may contain multiple Meshes and GameObjects). All paths are relative to the project folder. Like: "Assets/MyTextures/hello.png".

Note:
The assetPath parameter is not needed to be case sensitive.
ALL asset names & paths in Unity are with forward slashes.

See Also: AssetDatabase.LoadMainAssetAtPath, AssetDatabase.LoadAllAssetsAtPath