Disabling ALT & Application key in Win10 registry

Question

I would like to disable Alt & Application key in windows10 by editing registry key. I found this procedure:

HKEY_LOCAL_MACHINE\System\CurrentControlSet\Control

• and click on Keyboard Layout
• on Edit menu click Add value
• type in Sancode Map,
• click REG_BINARY as the Data Type and than click OK
• insert 00000000000000000300000000005BE000005CE000000000
• save & restart

as above is for Win keys i wanted to change it for Alt & Application key codes for Win keys are:

Left Win key -> 0x5B
Right Win key -> 0x5C

codes for Alt & Application keys are:

Application key -> 0x5D
Alt key -> 0x12

so i changed value from:

00000000000000000300000000005BE000005CE000000000

to:

00000000000000000300000000005DE0000012E000000000

...but i doesn't work. Any suggestions? I suspect value might be wrong but not sure how to validate.

Answer 1

Ok, so

1. procedure works (verified for Win10 IOT Enterprise 2015 LTSB)
2. problem was with incorrect mapping for desired keys

3. with help from @Ilnspectable I found correct mapping which is for Alt & Application keys: 38 & E0_5D respectively correct value should be:

   00,00,00,00,00,00,00,00,03,00,00,00,00,00,5D,E0,00,00,38,00,00,00,00,00

Note that in Windows they using byte format called little-endian (multi byte values are stored in memory from lowest values).

logic explained here