I got this response from Roger Aelbrecht concerning the errors in ZipBuilder 1.70 Demo1. I think you need have to add #if __BORLANDC__ > 0x550 #define min(x,y) ((x)<(y)?(x):(y)) #define max(x,y) ((x)>(y)?(x):(y)) #endif in main.h for Demo1 Once I did this, I got a clean compile and it looks like it is executing properly. Thanks to Russell and Roger for their help. Gene.