Tip - Wow64DisableWow64FsRedirection
() Wow64RevertWow64FsRedirection( )
Details - This function is useful for 32-bit applications that want to gain access to the native “%SystemRoot%\System32” directory in 64bit OS. By default, WOW64 file system redirection is enabled.
BOOL WINAPI Wow64DisableWow64FsRedirection
__out PVOID *OldValue
To restore file system redirection, the Wow64RevertWow64FsRedirect
ion function is used. Every successful call to the Wow64DisableWow64FsRedirec tion function must have a matching call to the Wow64RevertWow64FsRedirect ion function. This will ensure redirection is re-enabled and frees associated system resources.
BOOL WINAPI Wow64RevertWow64FsRedirection(
__in PVOID OldValue
The following example uses Wow64DisableWow64FsRedire
ction to disable file system redirection so that a 32-bit application that is running under WOW64 can open the 64-bit version of Notepad.exe in %SystemRoot%\System32 instead of being redirected to the 32-bit version in %SystemRoot%\SysWOW64.
HANDLE hFile = INVALID_HANDLE_VALUE;
PVOID OldValue = NULL;
// Disable redirection immediately prior to the native API
// function call.
// Any function calls in this block of code should be as concise
// and as simple as possible to avoid unintended results.
hFile = CreateFile(TEXT("C:\\Windows\\
// Immediately re-enable redirection. Note that any resources
// associated with OldValue are cleaned up by this call.
if ( FALSE == Wow64RevertWow64FsRedirection(
// Failure to re-enable redirection should be considered
// a criticial failure and execution aborted.
// The handle, if valid, now can be used as usual, and without
// leaving redirection disabled.
if( INVALID_HANDLE_VALUE != hFile )
// Use the file handle
Posted By : Velayudhan Pillai K