We&#39;ll.... I found out how MultiByteToWideChar (MBTWC) is implemented, and looks OK. <br><br>But then, there are following issues:<br><br>1 some functions (DefWindowProcA) call MBTWC, but with CP_ACP and HeapAlloc ALWAYS (IMHO should be: CP_THREAD_ACP, use some local cache if the 8-bit string is short enough, for performance)
<br>2 some functions (GetMonitorInfoA) call MBTWC using CP_THREAD_ACP<br>3 yet other functions (RegisterClassExA) call RtlCreateUnicodeStringFromAsciiz and and RtlFreeUnicodeString later (no TEB cache, allocation ALWAYS)<br>
4 and some other functions (CreateEventExA) call RtlAnsiStringToUnicodeString and use cache from TEB<br>5 other functions use RtlAnsiStringToUnicodeString with allocation, and RtlFreeUnicodeString later.<br>6 and some other functions (SetWindowTextA) call RtlAnsiStringToUnicodeString and  RtlFreeUnicodeString (allocation ALWAYS)
<br><br>Is this inconsistent or what?!<br><br>Best regards<br><br>Daniel<br>