/// <summary>Checks for the existence of a file or folder.</summary>
/// <param name="FilePattern">The path, filename, or file pattern to check. FilePattern is assumed to be in %A_WorkingDir% if an absolute path isn't specified.</param>
public static bool IfExist(this string FilePattern)
{
_AHK ahk = new _AHK();
return(ahk.IfExist(FilePattern));
}