Converting data to Informix from PICK!

My company is moving from a Pick database to Informix. I need to transfer / convert only our data, not the application software (we have bought new). This is typical maufactuing data, orders, invoices, accounts, customers, inventory and the like. Has anyone done this? Can it be done via tape rather than having to re-key all into the Informix DB? .Some of my concerns are dealing with Pick's variable field lengths and mulit-values. All suggestions and experiences greatly appreciated. Thanks, Peter Siegel