>i write the registry before and after i make an installation of the standard setup, and find 93 lines that were added, so in another tool i have also to write the registry i think. what are the rules of writing, depend on the machine, operating system, i don't know ?

Forgive me Yoch, but I am still fuzzy on what, specifically, you are trying to do. Did *you* program your app to write to the registry? Was it the installation program that wrote to the registry? What installation program? How did you get 93 entries in the registry for an application. What rules? The OS is going to be a WIndows product. The most infamous thing to remember is *be careful when dealing with the registry* because you could really trash a system.