What is the difference between Extension DLL and Regular
DLL?

Answer Posted / kaj telenar

An extension DLL is also known as an MFC extension dll or
and AFXDLL. It can only work with MFC applications and it
shares memory space with the MFC application that it is
linked with. The DllMain needs to call special routines to
let MFC know that it is linked in; otherwise you get weird
memory problems. Extension DLLs must use the dll version of
MFC, rather than the statically linked version.

A regular DLL can be written in any language, generally
exports routines in "PASCAL" format, and uses its own
memory pool.

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