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Question of Project Explorer in CCS

I would like to ask what is the purple icon means in the "Project Explorer" of CCS: 

I checked that this may refer to a folder, is it a folder contain the header files?

  • Anything that shows up under the "Includes" node is a folder that will be searched when looking for header files.  As to why that one is purple (and shows a name instead of the path) I don't know.  I suspect that it is setup as a variable (i.e. relative to the project or workspace location).  Where did the project come from?  I can likely figure out what is special about it by looking at now the path is specified.

    The include search path is specified in the project properties.  If you take a look at that I suspect that the way that path is specified is different.  For example in CCSv6 when I specify a path as relative to a project in my workspace the icon looks different.

    John