Problem With IfFileExists on 64bit Windows

[Iossoi]

I recently wrote script were I have to check existence of certain driver in users system. I did it by checking if driver file was in Windows\System32\drivers folder with IfFileExists command. I noticed that in 32bit Windows this method worked, but in 64bit Windows IfFileExist does not seems to see *.sys files in Windows\System32\drivers. If I use IfFileExist on some other files in other path it seems to work as it should in 64bit Windows.

I wrote this little script to demonstrate problem. It looks beep.sys that should (hopefully) exist on every Windows machine.

code:


Name "beepexist"

OutFile "beepexist.exe"

 

SetDateSave on

SetDatablockOptimize on

CRCCheck on

SilentInstall normal

XPStyle on



Function .onInit



    IfFileExists $SYSDIR\drivers\beep.sys 0 notfound

	

	MessageBox MB_OK "beep.sys found at: $SYSDIR\drivers\"

	Goto end

	

	notfound:

	

	MessageBox MB_OK "No beep.sys found at: $SYSDIR\drivers\"

	

	end:

	

FunctionEnd



Section "-boo"

;

SectionEnd

I first thought that $SYSDIR could give wrong path to C:\Windows\SysWOW64\drivers but path seems to correct and hardcoding path in script give same results. Why IfFileExists shows such behaviour on 64bit Windows ? Or have I understood something wrong?

Best regards

[Anders]

Disable file system redirection with the macros in x64.nsh, then $sysdir will be correct. Or use the half documented $windir\sysnative hack on 64 bit OS

[Iossoi]

Thank you for your answer. I did not understood that redirection happens even when I hardcode path to like this:

code:


IfFileExists C:\Windows\System32\drivers\beep.sys 0 notfound

Instead of using $SYSDIR.

[Afrow UK]

Redirection is done by the OS not NSIS.

Stu