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I have created floppy disk images of this version of WfW and since I didn't see it in the library yet I would like to share it here so someone can add it. This version also contains ISDN Setup and Programs on Disk 10. This version came in a box that is labelled "Microsoft Workgroup Addon für Windows".
Here is the download link: https://app.box.com/s/m9fzfyw6sr3yz9znfznisb25fru6nmqu