New to blender

I am new to Blender and I am having trouble importing files. I have the most recent version of Blender, I am running on a Mac, can not import .obj, Maya, .3ds. What am I doing wrong? Please help my remote position is relying on it.

Respectfully.

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Hi, blender cant import native maya files but obj and 3ds should work.
Look in User Prteferences > Addons > Import/Export which formats are enabled.
Don´t use “Open” use “Import” in the File Menu.

Cheers, mib.