AWS disable cache

we use file.c to parse files in flash by our own. In RpHSReadFile we check if a file has to parse with our parser or not. If a file was successful loaded and parsed, the AWS does not call the function RpHSReadFile after RpHSOpenFile again. How can I disable that? We need to call the function RpHSReadFile every time a file in flash was requested. Thank you for help! Hartmut