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"Targeted to ease Affinity Photo 2 support under Windows, use:
%localappdata%\Microsoft\WindowsApps\AffinityPhoto2.exe
to run Affinity Photo2 as an External Editor" (page 200 of the manual)

You can access the FastRawViewer manual via main Menu -> Help -> PDF Manual. The manual is a standard PDF file, with a table of contents; and the PDF itself is fully searchable.