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After you change one line of your code , it starts to differ from what people have installed on their machines , which means it is not the same version . You must tell the system that a file is binary through the b flag in fopen , or O_BINARY in open , or use the setmode library function to switch the handle to binary mode ( the latter method is handy when you did n't open the file in your code , like what happens with standard input and output ) . The TLKTDBG facility allows you to obtain debug information concerning SAS routines called by your code , and works with any of the supported programming languages . Before taking the time to vectorize your code , read the section on Performance Acceleration . When you add the button and place that code in the header section with the rest of your code , save the change and run your app .