Changing thermocouple type within recording

[ICEEngineer]

I have a DAQExpress file set up to record multiple T type thermocouple (TC) channels. One channel was not configured with the correct TC type before we recorded data so I have a recording with one channel offset from the rest. Is there a way to change the TC type within a recording file after it has been run so I can export the data formatted correctly? 

[altenbach]

Well, it's all basic math and the temperature is based on the calibration curve from the raw voltage reading. Formulas go of course both ways, so it would be easy to convert the current wrong temperature to a voltage based on on the wrong thermocouple calibration, then convert it back to temperature using the correct calibration. Do you have access to programming?

Do you know both types? What format is the file?