How to remap Right-Win and Right-Alt keyboard keys
Since Microsoft Keyboard Layout Creator (MSKLC) 1.4 fails to work properly you can use the following low-level solution that is derived from information on (German) WinFAQ.
Create the following two .reg files with a text editor of your choice and execute them alternately to load the given keys/values into your Windows' Registry:
HKLM^SYS^CCS^CTRL^Kbd_Layout^Scancode_Map#Swap_R-Win_R-Alt.reg
Windows Registry Editor Version 5.00
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Keyboard Layout]
"Scancode Map"=hex:\
00,00,00,00,\
00,00,00,00,\
03,00,00,00,\
38,e0,5c,e0,\
5c,e0,38,e0,\
00,00,00,00
HKLM^SYS^CCS^CTRL^Kbd_Layout^Scancode_Map#Reset.reg
Windows Registry Editor Version 5.00
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Keyboard Layout]
"Scancode Map"=hex:\
00,00,00,00,\
00,00,00,00,\
01,00,00,00,\
00,00,00,00
Note the reversed order of LSB (least significant byte) and MSB (most significant byte) within the 2 bytes of a scancode, a.k.a. little-endian. Note also the backslash character (\) for line continuation.
You have to restart Windows/reboot your machine for a change of mappings to take effect.
Technical Background Info
Scancode Map entry:
| Bytes | Size | Values | Description |
|---|---|---|---|
| 0 … 3 | 4 | 00 00 00 00 |
Header: Version info, always all 0 |
| 4 … 7 | 4 | 00 00 00 00 |
Header: Flags, always all 0 |
| 8 … 11 | 4 | LM¹HM²00 00 |
Header: Mappings count (c) + 1 (for the trailer)in little-endian byte order, i.e. at least 01 00 00 00
|
| 12 … s | c × 4 | LN¹HN²LO HO |
New / Old scancodesin little-endian byte order (s = 11 + c × 4) |
| t … t+3 | 4 | 00 00 00 00 |
Trailer (t = s + 1 = 12 + c × 4) |
¹ L ... low byte, least significant byte (LSB)
² H ... high byte, most significant byte (MSB)
See the following pages/documents for scancodes:
- WinFAQ: ScanCodes der Tasten (German; scancodes' byte order is already reversed there and such ready for entering into
.regfiles or directly into the Registry via Windows' Registry Editor) - Andries Brouwer: Keyboard scancodes
- Microsoft: Windows Hardware Dev Center Archive:
- Input / HID Archive: Keyboard Scan Code Specification (DOC)
- USB and 1394 Archive: USB HID to PS/2 Scan Code Translation Table (PDF)
UPDATE
MSKBLC works with Windows' DPI Settings of 100 % only (see Sam Arutuk's answer to my question Any ideas why Microsoft Keyboard Layout Creator 1.4 refuses to work properly on my Windows 7 Professional 64-Bit?):
Apparently the 
keys can't be remapped.