Dr.KoD
http://msdn2.microsoft.com/en-us/library/aa363858(VS.85).aspx
FH:=CreateFile(Pchar(path),$40000000,$00000002,nil ,2,0,0);
лень разбираца но вроде какой то параметр отвечает за атрибут файла системный скрытый для чтения и т д
dwFlagsAndAttributes

HANDLE WINAPI CreateFile(
__in LPCTSTR lpFileName,
__in DWORD dwDesiredAccess,
__in DWORD dwShareMode,
__in_opt LPSECURITY_ATTRIBUTES lpSecurityAttributes,
__in DWORD dwCreationDisposition,
__in DWORD dwFlagsAndAttributes, - вот это надо менять
__in_opt HANDLE hTemplateFile

Attribute Meaning

FILE_ATTRIBUTE_ARCHIVE
32
0x20
The file should be archived. Applications use this attribute to mark files for backup or removal.

FILE_ATTRIBUTE_ENCRYPTED
16384
0x4000
The file or directory is encrypted. For a file, this means that all data in the file is encrypted. For a directory, this means that encryption is the default for newly created files and subdirectories. For more information, see File Encryption.

This flag has no effect if FILE_ATTRIBUTE_SYSTEM is also specified.

FILE_ATTRIBUTE_HIDDEN
2
0x2
The file is hidden. Do not include it in an ordinary directory listing.

FILE_ATTRIBUTE_NORMAL
128
0x80
The file does not have other attributes set. This attribute is valid only if used alone.

FILE_ATTRIBUTE_OFFLINE
4096
0x1000
The data of a file is not immediately available. This attribute indicates that file data is physically moved to offline storage. This attribute is used by Remote Storage, the hierarchical storage management software. Applications should not arbitrarily change this attribute.

FILE_ATTRIBUTE_READONLY
1
0x1
The file is read only. Applications can read the file, but cannot write to or delete it.

FILE_ATTRIBUTE_SYSTEM
4
0x4
The file is part of or used exclusively by an operating system.

FILE_ATTRIBUTE_TEMPORARY
256
0x100
The file is being used for temporary storage. File systems avoid writing data back to mass storage if sufficient cache memory is available, because an application deletes a temporary file after a handle is closed. In that case, the system can entirely avoid writing the data. Otherwise, the data is written after the handle is closed.
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вроде че то типо того или я непонял )