create a new mime type to start programs in nemo with unknown extensions like .tc for truecrypt
quick and dirty:
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sudo -i # getting root
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cd /usr/share/mime/packages/
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cp keepassx.xml truecrypt.xml #(just keepassx because is for security too)
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edit truecrypt.xml # with usefull content -> application/x-truecrypt
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update-mime-database /usr/share/mime
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cd /usr/share/application
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edit defaults.list # -> insert truecrypt with truecrypt.desktop
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cp keepassx.desktop truecrypt.desktop
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edit keepassx.desktop # with usefull content -> e.g. set Exec=truecrypt
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killall nemo
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start nemo and double click a *.tc file -> truecrypt will promt with asking the password