am using Microsoft visual C++ 6, running on window xp. i create mkdir("C:/asd") and store all the files that i craeting during my program. End of the program, the folder and all the files will be delete/remove. I would like to know how can i lock/block the folder and files. I don't want to let other have access to the folder and files inside. I try using EncryptFile, but i still can decrypt it using other computer. Please help me out. Thanks