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Hi @HB_9843473,
Legacy files are worksheets that were created using previous versions of Mathcad. These files cannot be opened directly in Mathcad Prime XMCD MCDX converter can be used to convert legacy files.
To enable XMCD MCDX converter Mathcad 15 is necessary to be installed on the same machine where Mathcad Prime is installed
Thanks,
Vipul
Unfortunately, the download of Mathcad 15 seems to be no longer available.
Mathcad 15 M050: https://www.ptc.com/-/media/Files/Docs/Mathcad/Mathcad15-EN.zip