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GRUB2 UEFI didn't support linux16 and initrd16 command 
 
GRUB2 UEFI use linuxefi and initrdefi instead 
 
wimboot is 16 bit binary and GRUB2 can't load it in UEFI Mode 
 
if you edit your config like this linuxefi /wimboot 
 
the result Will be like this error no efi header 
 
so that is Impossible to load Winpe ISO in GRUB2 UEFI until now 
 
the only way to boot Winpe in GRUB2 UEFI Mode that Extract the contents of the Winpe iso to fat32 partition and that partition can't include any Windows OS. 
 
1- add tag to Winpe Fat32 partition named it any thing like Winpepartition.tag 
 
2- configuration on grub2: menuentry "Windows 10 64 bits"{ insmod part_gpt insmod chain search --file --no-floppy --set=root /Winpepartition.tag chainloader /efi/boot/bootx64.efi } 
 
 
 
 
 
找来这个方法,看来这个也可以用呢,虽然山寨,不过也能实现指定wim启动。。。。 |   
 
 
 
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