Switching samples within a project window

Hi,
A very useful feature is switching to the previous or next sample in the current folder directly within the project window. This is a SUPER functionality that (at the moment) can only be configured in Reaper, and people are happy to use it there. I don’t think it’s very difficult to implement or at least make a command for the macros please.
Thank you.
Den.
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I knew that someone would think to ask this. Can I not answer stupid questions?