I'm confused. Are you saying the WFCREATE command defaults to WF1?
Our workfile save format default is controlled by a setting under General Options/Data Storage/Workfile Format (WF2):

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When you run the WFSAVE command, and you don't specify a file extension, the file is saved using the default workfile format type.

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And you can overwrite this default by either specifying a file extension or using the "type=wf2" option.