search in envarc: usualy the imagefx setting a path for amigaguide command there.
correct, there may be a (text) file in RAM:env/ that looks for the amigaguide help files for ifx
ram:env/amigaguide/path
the file Path should read
"ImageFX4:Help"
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I don't think you actually need this ram text file. I have included in the IFX icon the following tooltype:
HELP=ImageFX4:Help
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that should let you access the amigaguide manual just by hiting the Help button on your amiga. (only when you are accessing it from the IFX program, of course) :-D