Try this, line separator is \0
:
reg add HKEY_CURRENT_USER\Test /t REG_MULTI_SZ /v "Test Multi SZ" /d "a\0b\0"
Enter reg add /?
for help at the command line.
Example:
reg add HKEY_CURRENT_USER\Test /t REG_MULTI_SZ /v "Test Multi SZ" /d "red\0green\0blue\0dark grey\0"
reg query HKEY_CURRENT_USER\Test
HKEY_CURRENT_USER\Test
Test Multi SZ REG_MULTI_SZ red\0green\0blue\0dark grey\0\0
Screenshots from regedit
:
main window
edit binary window
edit multiline window