Hyperlinks in source code comments

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Being able to insert hyperlinks in source code comments is very useful
e.g.:

//Google is a great search engine http://google.com

for (int i=0; i<256; ++i)
{
....
}

But what I want to do is insert hyperlinks to local documents that are
part of my solution. The problem is I can't figure out a way to insert
a relative hyperlink. For example, my documentation directory may be a
sibling directory of the code, so what I need is something like

file://..\Documentation\MyDesignDoc.htm

Is there a way to do this? It would be extremely useful to let source
maintainers jump directly to specification documents.
.

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