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gnomevfs-info file
For MATLAB files, which end with a *.m, GNOME will mistakingly think this is an objective-c source file. Consequently, it will refuse to open it in gedit. Why? Because GNOME is also smart enough to read the contents of the file and determine it to be a MATLAB file. Given the discrepancy, it prints out a warning saying there is a security problem.
To fix this problem, login as root and go to /usr/share/mime/packages and modify the file 'freedesktop.org.xml'
In that file you will see the objective-c mimetype, which comes before the matlab one.
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<mime-type type="text/x-objcsrc">
<sub-class-of type="text/x-csrc"/>
<comment>Objective-C source code</comment>
<comment xml:lang="bg">Изходен код на Objective C</comment>
<comment xml:lang="ca">codi font en Objective-C</comment>
<comment xml:lang="cs">Zdrojový kód v Objective-C</comment>
<comment xml:lang="da">Objektiv C-kildekode</comment>
<comment xml:lang="de">Objective-C-Quelltext</comment>
<comment xml:lang="el">πηγαίος κώδικας Objective-C</comment>
<comment xml:lang="eo">fontkodo en Objective-C</comment>
<comment xml:lang="es">código fuente en Objective-C</comment>
<comment xml:lang="eu">Objective-C iturburu-kodea</comment>
<comment xml:lang="fi">Objective-C-lähdekoodi</comment>
<comment xml:lang="fr">code source Objective-C</comment>
<comment xml:lang="hu">Objective-C forráskód</comment>
<comment xml:lang="it">Codice sorgente Objective-C</comment>
<comment xml:lang="ja">Objective-C ソースコード</comment>
<comment xml:lang="ko">Objective-C 소스 코드</comment>
<comment xml:lang="lt">Objective-C pradinis kodas</comment>
<comment xml:lang="ms">Kod sumber Objective-C</comment>
<comment xml:lang="nb">Objective-C-kildekode</comment>
<comment xml:lang="nl">Objective-C-broncode</comment>
<comment xml:lang="nn">Objective-C-kjeldekode</comment>
<comment xml:lang="pl">Kod źródłowy w Obiektowym C</comment>
<comment xml:lang="pt">código fonte Objective-C</comment>
<comment xml:lang="pt_BR">Código fonte Objective-C</comment>
<comment xml:lang="ru">исходный код Objective-C </comment>
<comment xml:lang="sq">Kod burues C objekt</comment>
<comment xml:lang="sr">Објектни-C изворни ко̂д</comment>
<comment xml:lang="sv">Objective-C-källkod</comment>
<comment xml:lang="uk">Вихідний код на мові Objective-C</comment>
<comment xml:lang="vi">Mã nguồn Objective-C</comment>
<comment xml:lang="zh_CN">Objective-C 源代码</comment>
<comment xml:lang="zh_TW">Objective-C 源代碼</comment>
<magic priority="30">
<match value="#import" type="string" offset="0"/>
</magic>
<glob pattern="*.m"/>
</mime-type>
All you have to do it swap them so that matlab comes first.
Then run the command:
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update-mime-database /usr/share/mime
Logout of GNOME and the problem should be fixed
