====== Check the file existence ======

The following function checks if a file exists.

<code c>#define WIN32_LEAN_AND_MEAN
#include <windows.h>

#ifndef INVALID_FILE_ATTRIBUTES
#define INVALID_FILE_ATTRIBUTES	((DWORD)-1)
#endif

/*
    Returns TRUE if filename is a file
    or FALSE if filename is either NULL, empty or it's a directory

*/

BOOL IsFile(const char *filename)
{
	DWORD dRet;

	if (!filename || filename[0] == '\0')
		return FALSE;

	dRet = GetFileAttributes(filename);

	if (dRet == INVALID_FILE_ATTRIBUTES)
		return FALSE;

	return (BOOL) !(dRet & FILE_ATTRIBUTE_DIRECTORY);
}</code>