How to run a file before setup with Inno Setup

[Code]
function PrepareToInstall(var NeedsRestart: Boolean): String;
var
   ResultCode: integer;
begin
   ExtractTemporaryFile('卸载.bat');
   if Exec(ExpandConstant('{tmp}\卸载.bat'), '', '', SW_SHOW, ewWaitUntilTerminated, ResultCode) then
   begin
   end
   else begin
   end;
   
end;

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