The MIME resolver definition file org-netbeans-modules-image-mime-resolver.xml
contains various definitions for image files, but only according to their magic
string, e.g:

    <file>
        <magic hex="424d"/>
        <resolver mime="image/bmp"/>
    </file>

This is very bad, because it forces MIME resolver to open almost every file it
comes across and look for the magic in it. This is too much overhead and I don't
see any viable reason for it. Why the hell do we need to recognize BMP file
which is named as something else then .bmp???

If there is no real reason for this, the contents of the XML should be changed
to something like this:

<MIME-resolver>
    <file>
        <ext name="gif">
        <magic hex="47494638"/>
        <resolver mime="image/gif"/>
    </file>
    <file>
        <ext name="jpg">
        <ext name="jpeg">
        <magic hex="ffd8ffe0"/>
        <resolver mime="image/jpeg"/>
    </file>
    <file>
        <ext name="png">
        <magic hex="89504e47"/>
        <resolver mime="image/png"/>
    </file>
    <file>
        <ext name="bmp">
        <magic hex="424d"/>
        <resolver mime="image/bmp"/>
    </file>
</MIME-resolver>