evince can't view pdf file 'test.pdf' as 'test'

[Yuandan Zhang]

Hi,
when view a pdf file, for example, test pdf,
evince test.pdf OK
xpdf test.pdf OK

when file name changed to 'test'
xpdf test OK (loaded as the pdf file),
evince test => ERROR to load

evince seems can't see it as pdf file, but issues an error
Unhandled MIME type: 'application/octet-stream'.

How to configure it and make evince detect the pdf file, not only rely on
the file name extension?

Yuandan
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