It is important to know where you need to place the DLL file for your specific platform. For most platforms you dont need to copy proper DLL file inside any specific folder, because most of platforms can find find and load DLLs from %windir% folder. XLSgate installer will automatically place all DLLs into %windir% for your convenience. So we recommend you to try to load DLL without doing anything, then try to copy the dll into platform specific directory.
Platform specific directory varies, please ask support of your trading platform to determine the spefic directory. Ask them the directory you need to copy DLL files, so you can load them.