
VC++ 5.0 API and VC++ 4.2
MS has never guarenteed that lib files from one version of thier
compiler would work with other versions. However they generally do work
without a problem.
The question that comes up is: Is this a regular Library or is it using
MFC? Is it C code or C++ code? Generally speaking if it just a generic
library it should be OK. But if it uses MFC or some feature of C++
which may have changed between 4.2 and 5.0 then your users will probably
have to upgrade