[RCD] common office apps formats (m$ and openoffice) are misdetected by libmagic (bug #1485311)

[Arkadiusz Miskiewicz]

#1485151 was solved after private talks with ALEC, so now new bug waiting for 
some action ...

http://trac.roundcube.net/ticket/1485311

The common office apps formats (m$ and openoffice) are misdetected by libmagic 
library and that means that roundcube sends such attachment with wrong 
Content-type.

I'm proposing to use plain filename extension based type detection for 
commonly misdetected formats. Example patch attached to bugreport.

Opinions?

-- 
Arkadiusz Miśkiewicz        PLD/Linux Team
arekm / maven.pl            http://ftp.pld-linux.org/
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