The TFileResolveHandle structure.

 // FileResolveHandle
 TFileResolveHandle   struct
  Result              word     // The function call result.
  FileHandle          byte     // The returned resolved file handle.
  WriteHandle         byte     // True if the returned handle is a write handle.
  Filename            byte[]   // The name of the file for which to resolve a handle.
 TFileResolveHandle     ends

Possible Result values include LDR_HANDLEALREADYCLOSED and LDR_SUCCESS.