Run google search for rdonlyres and it will return over 8,330,000 results.
It seems that rdonlyres is a directory name used on the public side of a Content Management System (CMS) for non html documents. This mostly means pdfs.
A classic url is www.example.com/NR/rdonlyres/6FB9F35B-FADD-44C2-A15F-B145FF9416F6/1392/report.pdf
The experienced web user will know that long URLs are bad, and more so when they contain seemingly random characters that humans cannot remember.

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