I have 2 projects.
The first one just generates a DLL.
The second one needs the first DLL.
But when I call a method from the DLL, I have a FileNotFoundException, with this message :
BDD, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null
I’m sure that the file exists.
Where I’m wrong ?
Agree with Kieren (+1). Maybe it is finding your DLL but it requires another dependent DLL that cannot be found. Or is there a signature issue (maybe you are looking for another DLL version, etc…)

To turn on fusion Log (you’ll have to create a couple fo registry keys):
BTW, fusion is the DLL that contains the logic to load an assembly (probing for local path and subfolders if specified, looking at the GAC, …). After running your executable, you’ll find a log detailing the issues the CLR has found when loading referenced assemblies (ignore the NativeImage logs, inspect just the Default logs).