Differences between Transfer Utility series

What are the specific differences between Transfer Utility, Ir-Transfer Utility C, and BHT-BASIC4.0 Transfer Utility?

The difference of each product is a supported communications protocol as the following table.

product supported communications protocol
BHT-BASIC4.0 Transfer Utility Ymodem protocol
BHT-Ir protocol
Ir-Transfer Utility(It3cw32.exe) BHT-Ir protocol
Transfer Utility(Tu3w32.exe) BHT protocol

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