The IQ-Player is rather old, misses time code information and for- and back winding which makes it rather useless.
"Special wave file" means a recording may not be read by other wave players with advanced features, e.g. SDR Console.
A very good solution is the use of HDSDR with the "ExtIO_ColibriDDC packagel".
It combines receiving, time scheduled recording and a replay with precise time information.
The same way the ExtIO Package can be used with SDR UNO and Zeus Radio.
A setback is, that the BPF features are not included.