Just found a way to upgrade my Windows 8 RC to RTM without losing files and apps:
* Extract the Windows 8 ISO or copy all files of the Windows 8 DVD to your HDD.
* Browse to the 'Sources' folder and open the file cversion.ini.
* Then find the entries as in the attachment below
* Change the value MinClient value to a value lower than one of the RC, so e.g. 8200 and save the file.
* Now...
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