Using a 32 bit DLL ?

From earlier applications I have a 32 bit DLL but no source code. Is there any way to use the functions inside in a 64 bit FTN95 program ?

There is no direct way that I know off.

One indirect way is to use the 32 bit DLL in a 32 bit application, then run this application at the same time and set up some kind of conversation with your 64 bit application.

64 bit Plato does this when it integrates with 32 bit SDBG. It creates shared memory for a 'pipe' and uses messages to 'send' and 'receive' data.

It requires a lot of work.