Is word character redefined in netrw?

According to ":help pattern", a word character is defined as [0-9A-Za-z]. When I press # or *, the search pattern becomes \<WordUnderCursor\>. The word WordUnderCursor highlights on all windows except for the netrw window (where there is a file named WordUnderCursor.m). However, if I remove the anchors to the beginning and end of the word in the search pattern, WordUnderCursor becomes highlighted in the netrw window. I did not think that netrw redefined some setting representing word characters (e.g, perhaps isword) to include the dot in WordUnderCursor.m, and I confirmed that there is not isword option.

How does netrw prevent \<WordUnderCursor\> from matching WordUnderCursor.m, and is there a way to prevent this prevention?

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