[CAD Document] Query CADDocument File for download to local

Then you can write down below code:

string NativeFileID = docItem.getProperty("native_file");

string ViewableFileID = docItem.getProperty("viewable_file");

Above line will return respective file id's.

To get individual file information:

Item NativeFile = myAras.newItem("File","get");

NativeFile.setID(NativeFileID );

NativeFile = NativeFile.apply();

This is return file item.

Similarly you can get file item for viewable file.