Solution:

Actually, that those example files was coding by Turbo C 2.0, and the "TC-EX1.C" has a PROJECT file. BUT, the project file just for Turbo C 2.0 ONLY. Anyway, user have to pay attention on the version of compiler. For example, If you want to compile those example files with Turbo C 3.0, please check following tips. 1) You have to re-built the project file first. Delete the original project file. => TC-EX1.PRJ 2) Enter the Turbo C 3.0 and NEW/OPEN a project file. => EX1.PRJ 3) Add two items into the new project file. => TC-EX1.C, MX-CS.OBJ 4) Load the example file. => TC-EX1.C 4) Make sure of the proper directory for the HEAD file. 5) Make sure of the "small" model of library. 6) Compile the example file. The attached file is the project file for Turbo C 3.0 only, just for your reference.