looks like to reopen same diagram to modify i am forced to save xml format in the first placeI'm not a draw.io expert, but your statement seems to be correct. According to its Browse dialog, the only supported formats for creating/editing are XML, VSDX, and GLIFFY:
Microsoft Excel topics include formulas, formatting, VBA macros and user-defined functions, and everything else related to the spreadsheet user interface, including error messages.
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