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In order to generate an
.xpt file from an
.idl file in recent versions of the Gecko \ XUL Runner SDK in Windows, you need to use the
typelib.py script. Assuming you installed your XULRunner SDK at
<MOZSDKDIR>, you then need to issue a command similar to
C:\working-dir> <MOZSDKDIR>\sdk\bin\typelib.py <InputFile.idl> -o <OutputFile.xpt> -I <MOZSDKDIR>\idl