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    Bug 
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    Resolution: Done
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     Not Evaluated Not Evaluated
- 
    Qt Creator 5.0.0
- 
    None
modifying MIME types in Options/Environment saves them in ~/.config/QtProject/qtcreatormimetypes/modifiedmimetypes.xml
however after restart the settings are lost.
upon qtcreator startup strace shows:
open("/home/radembek/.config/QtProject/qtcreator/mimetypes/modifiedmimetypes.xml", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
as workaround: creating a symbolic link between these paths works.