I'd suggest to update and try again. 7.0 wasn't added until later, so make sure to double-check the foot notes in the interoperability section.
http://www.vmware.com/support/converter/doc/releasenotes_conv303.html#interop
New in Converter 3.0.2 Update 1
Version 3.0.2 Update 1 is an update release of VMware Converter. It contains bug fixes described in Resolved Issues and a known issue described in Known Issues. (VMware Converter 3.0.2 Update 1 contains fixes that might not apply to you.)
New in Converter 3.0.2
Version 3.0.2 is a maintenance release of VMware Converter. It contains bug fixes described in Resolved Issues, and also incorporates the following new features:
Conversion of VMware hardware version 6 products: Workstation 6.x, VMware ACE 2.x, VMware Fusion 1.x, and VMware Player 2.x