Create user independent logfiles in C:\ProgramData - windows

Question

I would like to create logfiles for my application in an user independent lactation. AFAIK C:\ProgramData is good place for that.
I've tried it this way:
if not DirectoryExists('C:\ProgramData\MyApp') then
CreateDirectory('C:\ProgramData\MyApp', nil);
LogFileStream := TFileStream.Create('C:\ProgramData\MyApp\LogFile01.txt', fmCreate, (fmOpenRead or fmShareDenyNone));
The problem with this approach is that the created filed does not have Authenticated Users nor Everyone in Properties->Security->Group or user names.
This results in other users being unable to modify the created files.
But how can I achieve this, also other users being albe to modify the created files.
I think it must be possible to have files with this permission there. Some files do have this permission e.g. C:\ProgramData\Microsoft\Windows\Ringtones\Ringtone *.wav
Maybe either in
1.) somehow creating a 'MyApp' folder in C:\ProgramData with Authenticated Users or Everyone permission which would result in TFileStream automatically creating files with the same permission or
2.) somehow telling TFileStream to create the files with the required permission or
3.) somehow changing the files permission with some API function after its creation or
4.) some other way??

Answer 1

The default permissions in C:\ProgramData, aka FOLDERID_ProgramData allow any user to create new files and folders. However, only the user who creates the file or folder has permission to write to it.
So, if you wish to allow any user to modify objects under FOLDERID_ProgramData then you need to add a permissive ACL to grant those rights. You would typically do that when you installed your program. Create a folder under FOLDERID_ProgramData and add an ACL to grant rights to whichever class of users you wish to allow full access.
As an aside, clearly you should not be hard coding C:\ProgramData, but instead using FOLDERID_ProgramData with the known folder API. I guess the code in the question is just for testing, and your real program code does it correctly.