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Ok, I found a workable solution. The oeb format is actually just a mulitpart mime format. First I simply tried to just change the file extension to eml and open it with Thunderbird. This nearly works but has the draw back that only the first html file is opened as an email and the pictures are identified as attachments. As the second html file contains the book that didn't help much.
What helped was Total Commander's option to decode files in its File menu. That extracts all files. Than it is a little effort to rename the files and remove the text string that separates the parts in the mime file (a line starting with -- and then some chars). If you now zip the files and add them to Calibre it's possible to convert them to a new format.
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