For finding the center-point of the femoral condyles in Abaqus, you can use the "Create reference point" -> "Mid way bw two points" , option in the Abaqus part manager. You can pick the nodes on either side of the condyle and generate a center point. Then use the "Translation tool" in the Assembly m...

Add the ".zip" file extension to the file name, thus converting it to a zip file. Then you can extract the Abaqus '.inp' and Solidworks cad file from it, using WinZip or other software.