Thread overview
December 11
So, there is an issue. There is no D version for FileApi.h So, for people who want to use that file(which includes me) here is it translated into D.  I would also like to add that there are two files included in the original that are not translated into D yet: minwindef.h and winwinbase.h.

Enjoy, and tell me if anything is not working!

import core.sys.windows.winbase;
import core.sys.windows.windef;

public const uint CREATE_NEW = 1;
public const uint CREATE_ALWAYS = 2;
public const uint OPEN_EXISTING = 3;
public const uint OPEN_ALWAYS = 4;
public const uint TRUNCATE_EXISTING = 5;
public const DWORD INVALID_FILE_SIZE = 0xffffffff;
public const DWORD INVALID_SET_FILE_POINTER = -1;
public const DWORD INVALID_FILE_ATTRIBUTES = -1;

extern(Windows) public HANDLE CreateFileW(LPCWSTR lpFileName, DWORD dwDesiredAccess, DWORD dwShareMode, LPSECURITY_ATTRIBUTES lpSecurityAttributes, DWORD dwCreationDisposition, DWORD dwFlagsAndAttributes, HANDLE hTemplateFile);
extern(Windows) public DWORD GetFileAttributesW (LPCWSTR lpFileName);
extern(Windows) public DWORD GetFileSize (HANDLE hFile, LPDWORD lpFileSizeHigh);
extern(Windows) public DWORD SetFilePointer (HANDLE hFile, LONG lDistanceToMove, PLONG lpDistanceToMoveHigh, DWORD dwMoveMethod);
public struct BY_HANDLE_FILE_INFORMATION {
    DWORD dwFileAttributes;
    FILETIME ftCreationTime;
    FILETIME ftLastAccessTime;
    FILETIME ftLastWriteTime;
    DWORD dwVolumeSerialNumber;
    DWORD nFileSizeHigh;
    DWORD nFileSizeLow;
    DWORD nNumberOfLinks;
    DWORD nFileIndexHigh;
    DWORD nFileIndexLow;
  };
extern(Windows) public LONG CompareFileTime (const FILETIME *lpFileTime1, const FILETIME *lpFileTime2);
extern(Windows) public HANDLE CreateFileA (LPCSTR lpFileName, DWORD dwDesiredAccess, DWORD dwShareMode, LPSECURITY_ATTRIBUTES lpSecurityAttributes, DWORD dwCreationDisposition, DWORD dwFlagsAndAttributes, HANDLE hTemplateFile);
extern(Windows) public WINBOOL DefineDosDeviceW (DWORD dwFlags, LPCWSTR lpDeviceName, LPCWSTR lpTargetPath);
extern(Windows) public WINBOOL DeleteVolumeMountPointW (LPCWSTR lpszVolumeMountPoint);
extern(Windows) public WINBOOL FileTimeToLocalFileTime (const FILETIME *lpFileTime, LPFILETIME lpLocalFileTime);
extern(Windows) public WINBOOL FindCloseChangeNotification (HANDLE hChangeHandle);
extern(Windows) public HANDLE FindFirstChangeNotificationA (LPCSTR lpPathName, WINBOOL bWatchSubtree, DWORD dwNotifyFilter);
extern(Windows) public HANDLE FindFirstChangeNotificationW (LPCWSTR lpPathName, WINBOOL bWatchSubtree, DWORD dwNotifyFilter);
extern(Windows) public HANDLE FindFirstFileA (LPCSTR lpFileName, LPWIN32_FIND_DATAA lpFindFileData);
extern(Windows) public HANDLE FindFirstFileW (LPCWSTR lpFileName, LPWIN32_FIND_DATAA lpFindFileData);
extern(Windows) public HANDLE FindFirstVolumeW (LPWSTR lpszVolumeName, DWORD cchBufferLength);
extern(Windows) public WINBOOL FindNextChangeNotification (HANDLE hChangeHandle);
extern(Windows) public WINBOOL FindNextVolumeW (HANDLE hFindVolume, LPWSTR lpszVolumeName, DWORD cchBufferLength);
extern(Windows) public WINBOOL FindVolumeClose (HANDLE hFindVolume);
extern(Windows) public WINBOOL GetDiskFreeSpaceA (LPCSTR lpRootPathName, LPDWORD lpSectorsPerCluster, LPDWORD lpBytesPerSector, LPDWORD lpNumberOfFreeClusters, LPDWORD lpTotalNumberOfClusters);
extern(Windows) public WINBOOL GetDiskFreeSpaceW (LPCWSTR lpRootPathName, LPDWORD lpSectorsPerCluster, LPDWORD lpBytesPerSector, LPDWORD lpNumberOfFreeClusters, LPDWORD lpTotalNumberOfClusters);
extern(Windows) public UINT GetDriveTypeA (LPCSTR lpRootPathName);
extern(Windows) public UINT GetDriveTypeW (LPCWSTR lpRootPathName);
extern(Windows) public DWORD GetFileAttributesA (LPCSTR lpFileName);
extern(Windows) public WINBOOL GetFileInformationByHandle (HANDLE hFile, LPBY_HANDLE_FILE_INFORMATION lpFileInformation);
extern(Windows) public WINBOOL GetFileSizeEx (HANDLE hFile, PLARGE_INTEGER lpFileSize);
extern(Windows) public WINBOOL GetFileTime (HANDLE hFile, LPFILETIME lpCreationTime, LPFILETIME lpLastAccessTime, LPFILETIME lpLastWriteTime);
extern(Windows) public DWORD GetFileType (HANDLE hFile);
extern(Windows) public DWORD GetFullPathNameA (LPCSTR lpFileName, DWORD nBufferLength, LPSTR lpBuffer, LPSTR *lpFilePart);
extern(Windows) public DWORD GetFullPathNameW (LPCWSTR lpFileName, DWORD nBufferLength, LPWSTR lpBuffer, LPWSTR *lpFilePart);
extern(Windows) public DWORD GetLogicalDrives ();
extern(Windows) public DWORD GetLogicalDriveStringsW (DWORD nBufferLength, LPWSTR lpBuffer);
extern(Windows) public DWORD GetLongPathNameA (LPCSTR lpszShortPath, LPSTR lpszLongPath, DWORD cchBuffer);
extern(Windows) public DWORD GetLongPathNameW (LPCWSTR lpszShortPath, LPWSTR lpszLongPath, DWORD cchBuffer);
extern(Windows) public DWORD GetShortPathNameW (LPCWSTR lpszLongPath, LPWSTR lpszShortPath, DWORD cchBuffer);
extern(Windows) public UINT GetTempFileNameW (LPCWSTR lpPathName, LPCWSTR lpPrefixString, UINT uUnique, LPWSTR lpTempFileName);
extern(Windows) public WINBOOL GetVolumeInformationW (LPCWSTR lpRootPathName, LPWSTR lpVolumeNameBuffer, DWORD nVolumeNameSize, LPDWORD lpVolumeSerialNumber, LPDWORD lpMaximumComponentLength, LPDWORD lpFileSystemFlags, LPWSTR lpFileSystemNameBuffer, DWORD nFileSystemNameSize);
extern(Windows) public WINBOOL GetVolumePathNameW (LPCWSTR lpszFileName, LPWSTR lpszVolumePathName, DWORD cchBufferLength);
extern(Windows) public WINBOOL LocalFileTimeToFileTime (const FILETIME *lpLocalFileTime, LPFILETIME lpFileTime);
extern(Windows) public WINBOOL LockFile (HANDLE hFile, DWORD dwFileOffsetLow, DWORD dwFileOffsetHigh, DWORD nNumberOfBytesToLockLow, DWORD nNumberOfBytesToLockHigh);
extern(Windows) public DWORD QueryDosDeviceW (LPCWSTR lpDeviceName, LPWSTR lpTargetPath, DWORD ucchMax);
extern(Windows) public WINBOOL ReadFileEx (HANDLE hFile, LPVOID lpBuffer, DWORD nNumberOfBytesToRead, LPOVERLAPPED lpOverlapped, LPOVERLAPPED_COMPLETION_ROUTINE lpCompletionRoutine);
extern(Windows) public WINBOOL ReadFileScatter (HANDLE hFile, FILE_SEGMENT_ELEMENT[] aSegmentArray, DWORD nNumberOfBytesToRead, LPDWORD lpReserved, LPOVERLAPPED lpOverlapped);
extern(Windows) public WINBOOL SetFileTime (HANDLE hFile, const FILETIME *lpCreationTime, const FILETIME *lpLastAccessTime, const FILETIME *lpLastWriteTime);
extern(Windows) public WINBOOL SetFileValidData (HANDLE hFile, LONGLONG ValidDataLength);
extern(Windows) public WINBOOL UnlockFile (HANDLE hFile, DWORD dwFileOffsetLow, DWORD dwFileOffsetHigh, DWORD nNumberOfBytesToUnlockLow, DWORD nNumberOfBytesToUnlockHigh);
extern(Windows) public WINBOOL WriteFileEx (HANDLE hFile, LPCVOID lpBuffer, DWORD nNumberOfBytesToWrite, LPOVERLAPPED lpOverlapped, LPOVERLAPPED_COMPLETION_ROUTINE lpCompletionRoutine);
extern(Windows) public WINBOOL WriteFileGather (HANDLE hFile, FILE_SEGMENT_ELEMENT[] aSegmentArray, DWORD nNumberOfBytesToWrite, LPDWORD lpReserved, LPOVERLAPPED lpOverlapped);
extern(Windows) public WINBOOL GetVolumeNameForVolumeMountPointW (LPCWSTR lpszVolumeMountPoint, LPWSTR lpszVolumeName, DWORD cchBufferLength);
extern(Windows) public WINBOOL GetVolumePathNamesForVolumeNameW (LPCWSTR lpszVolumeName, LPWCH lpszVolumePathNames, DWORD cchBufferLength, PDWORD lpcchReturnLength);

extern(Windows) public DWORD GetFinalPathNameByHandleA (HANDLE hFile, LPSTR lpszFilePath, DWORD cchFilePath, DWORD dwFlags);
extern(Windows) public DWORD GetFinalPathNameByHandleW (HANDLE hFile, LPWSTR lpszFilePath, DWORD cchFilePath, DWORD dwFlags);
extern(Windows) public DWORD GetVolumeInformationByHandleW (HANDLE hFile, LPWSTR lpVolumeNameBuffer, DWORD nVolumeNameSize, LPDWORD lpVolumeSerialNumber, LPDWORD lpMaximumComponentLength, LPDWORD lpFileSystemFlags, LPWSTR lpFileSystemNameBuffer, DWORD nFileSystemNameSize);

struct WIN32_FILE_ATTRIBUTE_DATA {
    DWORD dwFileAttributes;
    FILETIME ftCreationTime;
    FILETIME ftLastAccessTime;
    FILETIME ftLastWriteTime;
    DWORD nFileSizeHigh;
    DWORD nFileSizeLow;
  };

  struct CREATEFILE2_EXTENDED_PARAMETERS {
    DWORD dwSize;
    DWORD dwFileAttributes;
    DWORD dwFileFlags;
    DWORD dwSecurityQosFlags;
    LPSECURITY_ATTRIBUTES lpSecurityAttributes;
    HANDLE hTemplateFile;
  };

extern(Windows) public WINBOOL CreateDirectoryA (LPCSTR lpPathName, LPSECURITY_ATTRIBUTES lpSecurityAttributes);
extern(Windows) public WINBOOL CreateDirectoryW (LPCWSTR lpPathName, LPSECURITY_ATTRIBUTES lpSecurityAttributes);
extern(Windows) public WINBOOL DeleteFileA (LPCSTR lpFileName);
extern(Windows) public WINBOOL DeleteFileW (LPCWSTR lpFileName);
extern(Windows) public WINBOOL FindClose (HANDLE hFindFile);
extern(Windows) public HANDLE FindFirstFileExA (LPCSTR lpFileName, FINDEX_INFO_LEVELS fInfoLevelId, LPVOID lpFindFileData, FINDEX_SEARCH_OPS fSearchOp, LPVOID lpSearchFilter, DWORD dwAdditionalFlags);
extern(Windows) public WINBOOL FindNextFileA (HANDLE hFindFile, LPWIN32_FIND_DATAA lpFindFileData);
extern(Windows) public WINBOOL FindNextFileW (HANDLE hFindFile, LPWIN32_FIND_DATAW lpFindFileData);
extern(Windows) public WINBOOL FlushFileBuffers (HANDLE hFile);
extern(Windows) public WINBOOL GetDiskFreeSpaceExA (LPCSTR lpDirectoryName, PULARGE_INTEGER lpFreeBytesAvailableToCaller, PULARGE_INTEGER lpTotalNumberOfBytes, PULARGE_INTEGER lpTotalNumberOfFreeBytes);
extern(Windows) public WINBOOL GetDiskFreeSpaceExW (LPCWSTR lpDirectoryName, PULARGE_INTEGER lpFreeBytesAvailableToCaller, PULARGE_INTEGER lpTotalNumberOfBytes, PULARGE_INTEGER lpTotalNumberOfFreeBytes);
extern(Windows) public DWORD GetFileType (HANDLE hFile);
extern(Windows) public WINBOOL GetFileAttributesExA (LPCSTR lpFileName, GET_FILEEX_INFO_LEVELS fInfoLevelId, LPVOID lpFileInformation);
extern(Windows) public WINBOOL GetFileAttributesExW (LPCWSTR lpFileName, GET_FILEEX_INFO_LEVELS fInfoLevelId, LPVOID lpFileInformation);
extern(Windows) public DWORD GetTempPathW (DWORD nBufferLength, LPWSTR lpBuffer);
extern(Windows) public WINBOOL LockFileEx (HANDLE hFile, DWORD dwFlags, DWORD dwReserved, DWORD nNumberOfBytesToLockLow, DWORD nNumberOfBytesToLockHigh, LPOVERLAPPED lpOverlapped);
extern(Windows) public WINBOOL ReadFile (HANDLE hFile, LPVOID lpBuffer, DWORD nNumberOfBytesToRead, LPDWORD lpNumberOfBytesRead, LPOVERLAPPED lpOverlapped);
extern(Windows) public WINBOOL RemoveDirectoryA (LPCSTR lpPathName);
extern(Windows) public WINBOOL RemoveDirectoryW (LPCWSTR lpPathName);
extern(Windows) public WINBOOL SetEndOfFile (HANDLE hFile);
extern(Windows) public WINBOOL SetFileAttributesA (LPCSTR lpFileName, DWORD dwFileAttributes);
extern(Windows) public WINBOOL SetFileAttributesW (LPCWSTR lpFileName, DWORD dwFileAttributes);
extern(Windows) public WINBOOL SetFilePointerEx (HANDLE hFile, LARGE_INTEGER liDistanceToMove, PLARGE_INTEGER lpNewFilePointer, DWORD dwMoveMethod);
extern(Windows) public WINBOOL UnlockFileEx (HANDLE hFile, DWORD dwReserved, DWORD nNumberOfBytesToUnlockLow, DWORD nNumberOfBytesToUnlockHigh, LPOVERLAPPED lpOverlapped);
extern(Windows) public WINBOOL WriteFile (HANDLE hFile, LPCVOID lpBuffer, DWORD nNumberOfBytesToWrite, LPDWORD lpNumberOfBytesWritten, LPOVERLAPPED lpOverlapped);

extern(Windows) public HANDLE CreateFile2 (LPCWSTR lpFileName, DWORD dwDesiredAccess, DWORD dwShareMode, DWORD dwCreationDisposition, CREATEFILE2_EXTENDED_PARAMETERS pCreateExParams);



For people who want to know, this is based off of this file:
https://github.com/Alexpux/mingw-w64/blob/master/mingw-w64-headers/include/fileapi.h
December 12
They have somehow ended up in winbase i.e. https://github.com/dlang/druntime/blob/a7915d60c8d5ebff4f79eb48a8c52e779d1dc176/src/core/sys/windows/winbase.d#L1740

This should be fixed in druntime.
December 11
On Friday, 11 December 2020 at 12:50:56 UTC, rikki cattermole wrote:
> They have somehow ended up in winbase i.e. https://github.com/dlang/druntime/blob/a7915d60c8d5ebff4f79eb48a8c52e779d1dc176/src/core/sys/windows/winbase.d#L1740
>
> This should be fixed in druntime.

Okay. I see. Whoops. Didn't know it was all in winbase.d Thanks for the info.
December 11
At some point windows sdk was refactored and code ended up in different places.