Congratulations, you invented the DLL.
Edit: Yes, that was a bit brief. A comment would have done. So let me elaborate. A little.
Using pre-compiled code to make compilation of your application faster, particularly targeting parts that are executed often, that is what a dynamic link library offers. It also allows sharing compiled code among different applications. The code in it can be addressed from both compiled languages and interpreted languages. That is the case for the Microsoft Windows world, I do not know about other environments.
DLL's where common in the Win32 era. Most if the Windows operating system is implemented as DLL's. The concept remains in the .net world, the extension of the files is still DLL, although we prefere to call them assemblies there.
So my point is that it is a great idea (although it took Microsoft a while to iron out the versioning issues, commonly known as "DLL hell"), but you are not the first one who came up with it.