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This is just a function I came up with in about 1 minute and thought I would share it with the community. It has no real practical use, so take it as something to learn from. #include <Constants.au3> MsgBox($MB_SYSTEMMODAl, '', CreateGUIDFromString('Some very simple string.')) MsgBox($MB_SYSTEMMODAl, '', CreateGUIDFromString('A GUID string.')) MsgBox($MB_SYSTEMMODAl, '', CreateGUIDFromString('1 chr')) ; #FUNCTION# ==================================================================================================================== ; Name ..........: CreateGUIDFromString ; Description ...: Convert a string to a valid GUID. ; Syntax ........: CreateGUIDFromString($sString) ; Parameters ....: $sString - A string value of any length. Depending on the length of the string, this function may ; return with succeeding zeros to pad the GUID to a length of 32 characters. ; Return values .: Success - GUID string ; Author ........: guinness ; Example .......: Yes ; =============================================================================================================================== Func CreateGUIDFromString($sString) Local Const $CHR_COUNT = 1, $MAX_LENGTH = 32 Local $sGUID = '' For $i = 1 To $MAX_LENGTH $sGUID &= Hex(Asc(StringMid($sString, $i, $CHR_COUNT)), 2) Next Return StringRegExpReplace($sGUID, '([[:xdigit:]]{8})([[:xdigit:]]{4})([[:xdigit:]]{4})([[:xdigit:]]{4})([[:xdigit:]]{12})(?:[[:xdigit:]]{0,})', '\{\1-\2-\3-\4-\5\}') EndFunc ;==>CreateGUIDFromString