use dll in different folder

Hello,

I have a question about calling dll files.

In my project I have created an exe-file developed in Fortran and this program uses functions from  dll-files in different subfolders. I have tested to have all dll-files in the same folder as my exe-file and everything works w/o any problems so this is not the problem.

But I want to use the dlls in the subfolders. (I do not want to ask my users to copy a lot of dlls from subfolders if I can avoid it)

Example what I want:

1. The dll sub.dll with visible function calc is placed in subfolder c:user\program\calc
2. The program myProg.exe in folder c:user\program  needs to use function calc from sub.dll in folder c:user\program\calc

Is there a trick to do this in Fortran?   (in other language it has worked with load and unload commands)

Very thankful if anyone can help me!