Inno-Setup doesn't allow access to all registry keys, why ?

Question

I use this code to know if a key exists or not :

  if RegKeyExists(HKEY_LOCAL_MACHINE, 'Software\Autodesk') then
  begin
    MsgBox('Key exists!!', mbInformation, MB_OK);
  end;

for this exemple, it works, i have the message box, but with this it doesn't:

  if RegKeyExists(HKEY_LOCAL_MACHINE, 'Software\Autodesk\Maya') then
  begin
    MsgBox('Key exists!!', mbInformation, MB_OK);
  end;

But the 'Maya' key exists on my computer. Can anybody help me ?

EDIT :

In fact, it seems that inno-setup don't access to the right keys... For exemple, with this code I list all the subkeys of HKEY_LOCAL_MACHINE\SOFTWARE, but (!) the result is all subkey of HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node ...

  if RegGetSubkeyNames(HKEY_LOCAL_MACHINE, 'SOFTWARE', Names) then
  begin
    S := '';
    for I := 0 to GetArrayLength(Names)-1 do
      S := S + Names[I] + #13#10;
    MsgBox('List of subkeys:'#13#10#13#10 + S, mbInformation, MB_OK);
  end;

why this Wow6432Node key ?

Answer 1

Are you sure that Software\Autodesk\Maya is a registry key? Maybe it's just a value and you have to use RegValueExists.

Answer 2

Let me guess... you're on Windows 7 64-bit?

It's not InnoSetup's fault at all, it's that the Registry is virtualized in Vista & higher, and on 64-bit there are branches for native 64-bit and WOW'ed 32-bit.

In this case, since InnoSetup is a 32-bit program, the OS directs all of its HKLM\Software Registry requests to the WOW6432Node.

If your program is 64-bit, then you want to use a 64-bit setup program too.