For manjaro to detect your Windows installation and add it in Grub, both systems need to be installed the same way then. If Windows is UEFI then Manajro needs to be installed in UEFI too. If Windows is MBR then Manjaro needs to be MBR. [root tip] Dual boot Manjaro and Windows guide is for UEFI though. here are some other threads Dual Boot when system is BIOS/MBR - #4 by Wollie
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