ok, figured a solution for me, just in case someone else needs an tip   1st, make a backup of your vdisk file ... just in case   in windows 10 (1703+) there a new tool added, mbr2gpt   so, i used powershell in admin mode   mbr2gpt /validate /allowFullOS  <-- if ok then mbr2gpt /convert /disk:0 /allowFullOS   now your win10 VM disk is prepared for EFI boot,.shut the VM down.   create a new win10 VM with your same settings (exept
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