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I was dual booting Ubuntu with Windows 10 on my HP ProBook 430 G3. I have decided to give Antergos a try over Ubuntu. After a successful installation my grub menu was showing only Antergos.

It was quite a hassle to add the Windows 10 entry but when I selecting it I get the following error:

error: not a regular file

Is it possible that my Windows efi file /boot/efi/EFI/Microsoft/Boot/bootmgfw.efi/grubx64.efi was somehow corrupted during the Antergos install?

This is the entry from the grub custom entry config /etc/grub.d/40_custom:

 if [ "$grub_platform" == "efi" ]; then
 menuentry "Windows 10 64-bit UEFI-GPT" 
 insmod part_gpt
 insmod fat
 insmod search_fs_uuid
 insmod chain
 search --fs-uuid --set=root --hint-ieee1275='ieee1275//disk@0,gpt2' --hint-bios=hd1,gpt2 --hint-efi=hd1,gpt2 --hint-baremetal=ahci1,gpt2 D1C2-3A9A
 chainloader /EFI/Microsoft/Boot/bootmgfw.efi
 
fi

Here is the result of sudo fdisk -l:

Disk /dev/sda: 931.5 GiB, 1000204886016 bytes, 1953525168 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disklabel type: gpt
Disk identifier: 

Device Start End Sectors Size Type
/dev/sda14 962799616 1707433983 744634368 355.1G Microsoft basic data
/dev/sda17 1912236032 1914243071 2007040 980M Windows recovery environment
/dev/sda18 1914243072 1949319167 35076096 16.7G Microsoft basic data
/dev/sda19 1949319168 1953513471 4194304 2G Microsoft basic data


Disk /dev/sdb: 232.9 GiB, 250059350016 bytes, 488397168 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: gpt
Disk identifier: 

Device Start End Sectors Size Type
/dev/sdb1 2048 1023999 1021952 499M Windows recovery environment
/dev/sdb2 1024000 1228799 204800 100M EFI System
/dev/sdb3 1228800 1261567 32768 16M Microsoft reserved
/dev/sdb4 1261568 295094942 293833375 140.1G Microsoft basic data
/dev/sdb5 295096320 296959999 1863680 910M Windows recovery environment
/dev/sdb6 296960000 300592811 3632812 1.7G Linux filesystem
/dev/sdb7 300592812 488397134 187804323 89.6G Linux filesystem

I have searched wiki and grub tutorials for Arch but I have not found description of the error that I am encountering. I have found this thread How to recover from grub renaming issue But the recommended steps did not resolve my issue. I have reinstalled the grub and re-created the grub config. The Windows 10 was not detected via os-prober either so adding it manually was the only option.