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I have a Powerpoint document in old (ppt) format. Version control is enabled. I need to change the file format to the new (pptx) format. I use Save As i Powerpoint and add the new file using New Version in PP. I also have to change the file type in PP from "MS Powerpoint" to "MS Powerpoint 2007 presentation" (Which should not be necessary!)
Now things seem ok, but I can no longer open the old versions of the document because PP believes they are in the new file format. The old versions should keep their original names (or extensions), or PP should have a file type for each version.