WINEDEBUG=+relay: why unicode arguments printed in form L"\0412\044b" and not L"\x412\x44b"? 044b sure not octal

[Илья Басин]

///////////////////////////
#include <windows.h>

int main() 
{
        MessageBoxExW(NULL, 
                L"\x412\x44b \x434\x435\x439\x441\x442\x432\x438\x442\x435\x43b\x44c\x43d\x43e \x445\x43e\x442\x438\x442\x435 \x443\x434\x430\x43b\x438\x442\x44c \"\x43f\x440\x438\x43f\x430\x440\x43a\x43e\x432\x430\x43d\x43d\x44b\x435\" \x43f\x438\x441\x44c\x43c\x430?\r\r\x410\x442\x440\x438\x431\x443\x442 \x41f\x430\x440",
                L"The Bat! Voyager",
                0x00012133,
                0x00000019);
}
///////////////////////////

# WINEDEBUG=+relay wine msgbox.exe 2>&1 | grep "MessageBoxExW"
0009:Call user32.MessageBoxExW(00000000,0040a028 L"\0412\044b \0434\0435\0439\0441\0442\0432\0438\0442\0435\043b\044c\043d\043e \0445\043e\0442\0438\0442\0435 \0443\0434\0430\043b\0438\0442\044c \"\043f\0440\0438\043f\0430\0440\043a\043e\0432\0430\043d\043d\044b\0435\" \043f\0438\0441\044c\043c\0430?\r\r\0410\0442\0440\0438\0431\0443\0442 \041f\0430\0440",0040a000 L"The Bat! Voyager",00012133,00000019) ret=0040101c
0009:Ret  user32.MessageBoxExW() retval=00000000 ret=0040101c