Inno Setup: Checking existence of a file in 32-bit System32 (Sysnative) folder - inno-setup

Question

I have a sys file in the System32\Drivers folder called gpiotom.sys (custom sys file). My my application is strictly 32-bit compatible only, so my installer runs in 32-bit mode. My script needs to find if this sys file exists or not.
I used the FileExists function explained on the below post but it does not work since it only works for 64-bit application only:
InnoSetup (Pascal): FileExists() doesn't find every file
Is there any way I can find if my sys file exists or not in a 32-bit mode?
Here is my code snippet in Pascal Script language:
function Is_Present() : Boolean;
begin
Result := False;
if FileExists('{sys}\driver\gpiotom.sys') then
begin
Log('File exists');
Result := True;
end;
end;

Answer 1

In general, I do not think there is any problem running an installer for 32-bit application in 64-bit mode. Just make sure you use 32-bit paths where necessary, like:
[Setup]
DefaultDirName={pf32}\My Program
Anyway, if you want to stick with 32-bit mode, you can use EnableFsRedirection function to disable WOW64 file system redirection.
With use of this function, you can implement a replacement for FileExists:
function System32FileExists(FileName: string): Boolean;
var
OldState: Boolean;
begin
if IsWin64 then
begin
Log('64-bit system');
OldState := EnableFsRedirection(False);
if OldState then Log('Disabled WOW64 file system redirection');
try
Result := FileExists(FileName);
finally
EnableFsRedirection(OldState);
if OldState then Log('Resumed WOW64 file system redirection');
end;
end
else
begin
Log('32-bit system');
Result := FileExists(FileName);
end;
if Result then
Log(Format('File %s exists', [FileName]))
else
Log(Format('File %s does not exists', [FileName]));
end;