Like this:

•     links in the same directory as the current page have no path information listed: filename
•     sub-directories are listed without any preceding slashes: weekly/filename
•     links up one directory are listed as: ../filename

Of course for Poser you would replace the slashes with colons.

I know they can use paths relative to the runtime, so why not relative to the containing file?

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OS: Windows 10 64-bit, Poser: 10