Error in SYS_FS_FileOpen() causes SYS_FS_Error() to return an invalid value (moser)

For the function SYS_FS_FileOpen() failure is defined by telling that SYS_FS_FileOpen() is returning SYS_FS_HANDLE_INVALID. According to the help file the reason for a failure of SYS_FS_FileOpen() can be retrieved with SYS_FS_Error(). The help says, that ..