need help on playing m3u8 file with mplayer

From	Long Wind <longwind2@yahoo.com>
Newsgroups	linux.debian.user
Subject	need help on playing m3u8 file with mplayer
Date	2021-05-14 02:00 +0200
Message-ID	<Cetpg-19X-1@gated-at.bofh.it> (permalink)
References	<Cetpg-19X-3@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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m3u8 file include a line below
#EXT-X-KEY:METHOD=AES-128,URI="https://ts-qsg.qinbuyan666.com/20210511/Ql6iBJVB/1100kb/hls/key.key"

i want to change it to local file:
#EXT-X-KEY:METHOD=AES-128,URI="file:///home/zhou/key.key"
it doesn't work, mplayer complains: 

[hls,applehttp @ 0xb7791e20]Filename extension of 'file:///home/zhou/key.key' is not a common multimedia extension, blocked for security reasons.
If you wish to override this adjust allowed_extensions, you can set it to 'ALL' to allow all
Unable to open key file file:///home/zhou/key.key

how to solve it?? Thanks!

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need help on playing m3u8 file with mplayer Long Wind <longwind2@yahoo.com> - 2021-05-14 02:00 +0200
  Re: need help on playing m3u8 file with mplayer Dan Ritter <dsr@randomstring.org> - 2021-05-14 02:40 +0200

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