open inventor part in solid works but Cant edit it.

Can we open inventor file to Solidworks and modified in Solidworks? I try and I did open inventor file in Solidworks but it won't allow me to do any modification like dimension change and make the little different cut. 

I want to edit and the part in SolidWorks which I attached.

any update would appreciate, 

Thank you.

SolidworksSheet Metal