Cannot find text in files

After reading the RCEarchive i decompiled the Setup.ins with ISdoc122. I found some text about serial, it's like that:

label101:
lString6 = SUPPORTDIR ^ "lcnsinfo.bmp";
DialogSetInfo(1, lString6, 0);
StrLoadString("", "TEXT_ENTER_SERIAL_TITLE", lString0);
StrLoadString("", "TEXT_ENTER_SERIAL", lString1);
lString2 = string4;
StrLoadString("", "TEXT_SERIAL", lString6);
function16(lString0, lString1, lString6, lString2);
lNumber0 = LAST_RESULT;
lNumber2 = lNumber0 = 12;
if (lNumber2 = 0) then
goto label103;
endif;
return(lNumber0);
StrLength(lString2);
lNumber1 = LAST_RESULT;
lNumber2 = lNumber1 != 17;
GetByte(lNumber3, lString2, 3);
lNumber3 = lNumber3 != 45;
lNumber2 = lNumber2 || lNumber3;
GetByte(lNumber3, lString2, 6);
lNumber3 = lNumber3 != 45;
lNumber2 = lNumber2 || lNumber3;
GetByte(lNumber3, lString2, 11);
lNumber3 = lNumber3 != 45;
lNumber2 = lNumber2 || lNumber3;
if (lNumber2 = 0) then
goto label104;
endif;
StrLoadString("", "ERROR_SERIAL_WRONG", lString6);
Sprintf(lString5, "%s (%#lx)", lString6, -534863864);
MessageBox(lString5, -65535);
return(0);

Can anyone help me furthe how to get to the serial?

Thanx in advance

Mahmut