ty all i think that i need to explain myself a little more .im writing some program in C.my client want that this program will have the option to run some php script on his machine.for the php script i wrote some extension, and when i compiled it and tried to run it with the php binary , the php complained about the the module api does not match in the php and in the extension, so i tried to compile every thing , and now every thing goes fine , but only on computers that have visual studio installed on them. since on my client computer there is no vs im prety stuck .abput changing the path , i put all the files in the same directory so that isnt the problem .