Hello,
Sometime around Windows Vista, MS got rid of the functions SHGetSetFolderCustomSettingsA and SHGetSetFolderCustomSettingsW.
This means those entry points no longer exist and any attempt to use those functions in any version of Windows starting with Vista and later will cause the program to fail loading (since the loader will not be able to find the entry points anywhere.)
Related to that, there were SHFOLDERCUSTOMSETTINGSA and SHFOLDERCUSTOMSETTINGSW structures. They are both gone. there is only a SHFOLDERCUSTOMSETTINGS structure, documented at:
https://learn.microsoft.com/en-us/windows/win32/api/shlobj_core/ns-shlobj_core-shfoldercustomsettingswhich is used by SHGetSetFolderCustomSettings (note the absence of "A" and/or "W")
Basically, as of Windows Vista and later there is only a SHGetSetFolderCustomSettings function which takes a SHFOLDERCUSTOMSETTINGS.
Anything else no longer exists, is no longer declared in the C headers and no longer documented online.
The current non A/W definition in shlobj.pp will fail because it is not using the correct structure definition (it should use the current SHFOLDERCUSTOMSETTINGS definition which uses wide chars, not chars.
HTH.
Factoid, in some versions of Windows, the ordinal of the old "A" version is forwarded to the dll SHUNIMPL which will cause the process to fail (the dll's entry point always returns false, telling the loader the load failed thus causing the process not to load.) The "W" is probably redirected too but, a cursory look was not enough to make the determination.
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