Get Internet Explorer version

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C.1 Get Internet Explorer version

 ; GetIEVersion
 ;
 ; Based on Yazno's function, http://yazno.tripod.com/powerpimpit/
 ; Returns 1-6 (IE Version) or '' (IE is not installed) on top of the stack
 ;
 ; Usage:
 ;   Call GetIEVersion
 ;   Pop $R0 ; at this point $R0 is "5" or whatnot

 Function GetIEVersion
 Push $R0
   ClearErrors
   ReadRegStr $R0 HKLM "Software\Microsoft\Internet Explorer" "Version"
   IfErrors lbl_123 lbl_456

   lbl_456: ; ie 4+
     Strcpy $R0 $R0 1
   Goto lbl_done

   lbl_123: ; older ie version
     ClearErrors
     ReadRegStr $R0 HKLM "Software\Microsoft\Internet Explorer" "IVer"
     IfErrors lbl_error

       StrCpy $R0 $R0 3
       StrCmp $R0 '100' lbl_ie1
       StrCmp $R0 '101' lbl_ie2
       StrCmp $R0 '102' lbl_ie2

       StrCpy $R0 '3' ; default to ie3 if not 100, 101, or 102.
       Goto lbl_done
         lbl_ie1:
           StrCpy $R0 '1'
         Goto lbl_done
         lbl_ie2:
           StrCpy $R0 '2'
         Goto lbl_done
     lbl_error:
       StrCpy $R0 ''
   lbl_done:
   Exch $R0
 FunctionEnd

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