#ifndef _NTIOAPI_H
typedef enum _FILE_KNOWN_FOLDER_TYPE
{
    KnownFolderNone = 0,
    KnownFolderDesktop,
    KnownFolderDocuments,
    KnownFolderDownloads,
    KnownFolderMusic,
    KnownFolderPictures,
    KnownFolderVideos,
    KnownFolderOther,
    KnownFolderMax
} FILE_KNOWN_FOLDER_TYPE;
View code on GitHub// ntifs.h
typedef enum _FILE_KNOWN_FOLDER_TYPE {
  KnownFolderNone,
  KnownFolderDesktop,
  KnownFolderDocuments,
  KnownFolderDownloads,
  KnownFolderMusic,
  KnownFolderPictures,
  KnownFolderVideos,
  KnownFolderOther,
  KnownFolderMax
} FILE_KNOWN_FOLDER_TYPE;
View the official Windows Driver Kit DDI referenceThis enumeration is documented in Windows Driver Kit.
A FILE_KNOWN_FOLDER_TYPE value identifies a known folder.
KnownFolderNoneThe folder is not a known folder type.
KnownFolderDesktopThe Desktop folder.
KnownFolderDocumentsThe Desktop folder.
KnownFolderDownloadsThe Desktop folder.
KnownFolderMusicThe Desktop folder.
KnownFolderPicturesThe Desktop folder.
KnownFolderVideosThe Desktop folder.
KnownFolderOtherThe folder is a known folder type other than one of the above identified folders.
KnownFolderMaxThe maximum value for this enumeration.