Added nsExec /MBCS switch

git-svn-id: https://svn.code.sf.net/p/nsis/code/NSIS/trunk@7221 212acab6-be3b-0410-9dea-997c60f758d6

Contrib/nsExec/nsExec.txt

@@ -6,17 +6,17 @@ without opening a dos box.
 
 Usage
 -----
-nsExec::Exec [/OEM] [/TIMEOUT=x] path
+nsExec::Exec [/MBCS] [/OEM] [/TIMEOUT=x] path
 Pop $0
 
 -or-
 
-nsExec::ExecToLog [/OEM] [/TIMEOUT=x] path
+nsExec::ExecToLog [/MBCS] [/OEM] [/TIMEOUT=x] path
 Pop $0
 
 -or-
 
-nsExec::ExecToStack [/OEM] [/TIMEOUT=x] path
+nsExec::ExecToStack [/MBCS] [/OEM] [/TIMEOUT=x] path
 Pop $0 ; Return
 Pop $1 ; Output
 
@@ -24,6 +24,8 @@ All functions are the same except ExecToLog will print the output
 to the log window and ExecToStack will push up to ${NSIS_MAX_STRLEN}
 characters of output onto the stack after the return value.
 
+Use the /MBCS switch to disable Unicode detection and always treat the text as ANSI.
+
 Use the /OEM switch to convert the output text from OEM to ANSI.
 
 The timeout value is optional.  The timeout is the time in