specialFolderPath, Microsoft Window, and 64 bits

Paul Dupuis paul at researchware.com
Tue Mar 31 08:37:26 EDT 2020

On Windows, the SpecialFolderPath function can use Constant Special Item 
ID List (CSIDL) values, but since Windows Vista, developer were supposed 
to switch to using the Microsoft Known Folder ID system instead (I just 
learned this, so there's that!) (see 

Under CSIDL, specialFolderPath("38") is the equivalent of 
CSIDL_PROGRAM_FILES or C:\Program Files\ on older systems or C:\Program 
Files (x86)\ on Windows 8 or 10 (for 32 bit apps)

Under KNOWNFOLDERID, this is FOLDERID_ProgramFiles and there is a 
seconds KNOWNFOLDERID, FOLDERID_ProgramFilesX64 that on 64 bit Window 8 
and 10 gets you the 64 bit app installation folder, typically C:\Program 

Under LiveCode 9.x.x (up to 9.6.0dp3) I can see no way to obtain the 
64bit application installation folder using SpecialFolderPath? Does 
anyone know if this is correct or am I missing something?

And does anyone know if LC plans to update the specialFolderPath 
function on Windows to use KNOWNFOLDERID? Or if it currently uses 
KNOWNFOLDERID (for all I know).

My use case is that I need to check both the 32 bit app installation 
folder and the 64 bit app installation folder to see if a particular app 
is installed (either the 32 or 64 bit version could be present) and I 
would rather NOT hard code the paths since we do run into non-standard 
installations among our customer base.

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