Comment # 2 on bug 1202847 from Juergen Merkel

Hallo Wolfgang

the m3u file is served by VDR / vdradmind running on one of my servers, not
publicly accessible. Not sure whether there are servers 
in the internet that serve out m3u links that you could try.

vdradmind is configured to serve out m3u files and those are received well by
all firefox browsers except for the ones running natively on TW. 
As I mentioned a snap version on the same TW runs without problem. 
The download dialog on native firefox shows a vdradmind.mxu file while the snap
version firefox shows vdradmin.m3u.

I only noticed there is a problem because vlc did not play certain files.
Regrettably only after some time, so I can't pinpoint when this problem occured
first.
When vlc does not play certain files it complains about garbage in the input -
which turned out to be Umlauts in the description of the link within the
m3u/mxu link respectively.
The contents of such a m3u/mxu file look like this:

#EXTINF:0,BR Fernsehen S���d HD
http://192.168.178.15:3000/6

If this is sent by firefox to vlc with filetype m3u this file is opened by vlc,
if sent as filetype mxu vlc complains about garbage ("���") - I figured out vlc
considers m3u utf8 while mxu is not.
So question is what causes firefox to change the file extension from m3u to
mxu?

br

Juergen