When building workspaces that needs to run on various platforms with various operate systems I use the FME parameter FME_OS to create OS specific attributes to read/write data. But this parameter is excluded in the documentation:
https://docs.safe.com/fme/html/FME_Desktop_Documentation/FME_Workbench/!Transformer_Parameters/FME_parameters.htm and it's not in the help at all: https://docs.safe.com/fme/html/FME_Desktop_Documentation/FME_Workbench/Search.htm?q=fme_os
One specific thing I think should be useful (at least for me) is which values this parameter could hold. Right now I need to find a computer which have that specific OS and try the parameter to see which value the parameter holds. Not that streamlined.