Can FME be used for secondary development in winfrom? There are secondary development tutorials
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What is "winfrom", do you perhaps mean .NET?
Generally speaking, there are two options:
FME Desktop: use the .NET (or, even better, the C++) API libraries, you'll find the documentation here <FMEHOME>\\fmeobjects\\dotnet\\apidoc
FME Server: use the rich REST API, documentation can be found here https://docs.safe.com/fme/html/FME_REST/apidoc/v3/
Out of the two I'd say that FME Server makes the most sense for "secondary development", if I'm understanding you correctly.