oh man... the OCX project is not meant to be incorporated into another project. The source is provided so you can compile the original OCX, (hopefully with a copy of an already compiled version to keep binary compatibility!)

It is not recommended to use the source code to compile another binary.
If you want to use these outside of the OCX - use the std EXE project code.

if you don't know what the manifests are for - or why you use them, don't download them. you don't need them.