DllNotFoundException for .dll which is in current folder

Question

I'm getting a System.DllNotFoundException for a .dll which is in the same folder as the executable whenever my application attempts to use a function which exists in the DLL. The weird thing is that it is only occurring on one user's PC; it works fine on my dev PC and it works fine on one non-dev PC that I tried it on. Also, there are other DLLs in the folder which are being found and used correctly. The DLL in question is a native library which is referenced by my application via another DLL which is a c# wrapper for the native library.

My initial instinct is that there must be some other library being referenced by this DLL which doesn't exist on the problematic PC, but I cannot imagine what library this PC could be missing that the other non-dev PC has.

So my questions are this: is there a way to determine the dependencies of a given DLL file? Keep in mind that the DLL in question is a native library (i.e. not managed code), and I do not have access to it's source code. And if it turns out no dependency is missing, what else might cause such an issue?

Answer 1

For unmanaged dlls you can use Dependency Walker to find dependencies.

Answer 2

I would suggest using ILSpy to open the dll and view its dependencies first.