Can anyone tell me, what is the difference in the files stored on the transmitter module card and the ones stored on the receiver card?

Hello,
There are two reasons. The small receivers do not have a recording capability. This is achieved through the telemetry backlink from the receiver. This equals a telemetry recording.
The transmitter card logs all information that is available to the transmitter including the data return from the receiver. At times it can happen that the backlink from the receiver is interrupted. Then there is no data available from the receiver.
The big receivers keep recording, so that after the flight you can see what happened and what might be the reason for the interruption. If the model crashes with one of the big receivers, you can afterwards tell what happened. Its like a black box in the airliners.
I hope this helps,
Gerhard

Thankyou Gerhard,
That's helpful.
So if I've understood correctly, both the transmitter and receiver store the same data if the transmissions are uninterrupted, with the additional benefit of the receiver capturing but not necesarily transmitting (or the tranmsitter not necessarily receiving) the data. I presume then that any gps or vario data captured, is also stored on both cards.

What progeam are you using to open your LOG files. I am able to read the memory card but I can't open them?

Happy New Year,
you can download the program from www.weatronic.com and open it in the Gigacontrol software.
Gerhard