Escape character to enter string in dhcp boot file

Here are some of my “guesses” … none will result in the file reading “boot/x64/wdsmgfw.efi”.  The x5c that hugleo suggested (thank you) and the “\” are the only ones that actually surpressed the x64 from becoming a “d”, but I could not then get rid of the “x5c” or the “\”!

I typed in: set system services dhcp boot-file ‘boot\x64\wdsmgfw.efi’
It shows:   set system services dhcp boot-file “bootd\wdsmgfw.efi”

I typed in: set system services dhcp boot-file “boot\x5cx64\wdsmgfw.efi”
It shows: set system services dhcp boot-file “boot\x5cx64\wdsmgfw.efi”

I typed in: set system services dhcp boot-file “boot\x64\wdsmgfw.efi”
It shows: set system services dhcp boot-file “bootd\wdsmgfw.efi”

I typed in: set system services dhcp boot-file “boot\/x64\wdsmgfw.efi”
It shows:   set system services dhcp boot-file “boot\/x64\wdsmgfw.efi”

I typed in: set system services dhcp boot-file boot\/x64\wdsmgfw.efi
It shows: set system services dhcp boot-file “boot\/x64\wdsmgfw.efi”

I typed in: set system services dhcp boot-file boot\\x64\wdsmgfw.efi
It shows: set system services dhcp boot-file “boot\d\wdsmgfw.efi”