You can use the File System Object to make use of ReadAll functionality:
 Code:
Dim $ForReading, $ForWriting, $ForAppending
$ForReading = 1
$ForWriting = 2
$ForAppending = 8
Dim $TriStateUseDefault, $TriStateTrue, $TriStateFalse
$TriStateUseDefault = -2	;-2 Opens the file using the system default
$TriStateTrue = -1		;-1 Opens the file as Unicode
$TriStateFalse = 0		;0 Opens the file as ASCII

Dim $strFile, $objFSO, $objFile, $objFileContent
$strFile = "C:\Windows\system32\drivers\etc\hosts"
$objFSO = CreateObject("Scripting.FileSystemObject")
$objFile = $objFSO.OpenTextFile($File, $ForReading, $TriStateTrue)
$objFileContent = $objFile.ReadAll
$=MessageBox($objFileContent,"Info")
$objFile.Close