Finally I found this link extremely descriptive of the contents of FDC.
https://www.oncourse-software.co.uk/fdc ... ockpit.htm
But there is no info about MFS20 and I'm a bit worried that it won't work 100% or that being able to add the desired planes and use the tool to create the checklits is a hassle to do it and that takes a huge amount of time!
Currently I create my checklit reading files by Here Attacks it takes me 4-5 hours for a single-engine aircraft and about fifteen hours for a 737 for example.
But all the check items listed in French are what I want. (but without verification by the software).
FDC seems to him to check each action or switch which of course is much more interesting.
But FDC has no demo and it's very frustrating! because investing and not being satisfied after having tested it is not reassuring!
and so I really hesitate to make this purchase without a demo !