You have been subscribed to a public bug:
To reproduce:
1. Try to open the file attached below by double clicking it in nautilus.
2. See the error message:
"The filename "covariance.m" indicates that this file is of type
"Objective-C source code". The contents of the file indicate that the
file is of type "MATLAB script/function". If you open this file, the
file might present a security risk to your system.
Do not open the file unless you created the file yourself, or received
the file from a trusted source. To open the file, rename the file to the
correct extension for "MATLAB script/function", then open the file
normally. Alternatively, use the Open With menu to choose a specific
application for the file. "
The problem here is that .m is a common extension for Objective-C source
code AND for MATLAB/octave scripts. I applaud Nautilus for being able to
identify the file correctly (it is a plaintext matlab script file) but
it would be nice to be able to open it :)
Temporary workaround: Right click the file and choose an option from the
Open With menu. Then the check doesn't appear to run. Hopefully that's
not a bug too?
** Affects: shared-mime-info (Ubuntu)
Importance: Low
Status: Unconfirmed
** Tags: likely-dup
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Nautilus gives incorrect warning when opening files of .m extension
https://bugs.launchpad.net/bugs/112228
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