The second file is just a backup of the first one for security reasons (it is loaded if loading the first one fails for some reason, for example in case of a file error after a crash of the application).

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</td><td><a href="http://crawler.trillinux.org"><img align="right" style="border:0" src="http://crawler.trillinux.org/img/netsize.png" alt="Network size"></a></td></table>