Personally, I would leave distribution of files to whatever mechanism is in place for administrating the machines you have, but I understand that this is not always possible.

I don't use PPD, so I don't know how it specifies files that should go into the bin directory of the Perl distribution.

From reading some documentation on LoadLibrary, Windows also looks in the current directory to load a DLL, so you could change to the directory and then try to load the DLL through Win32::API. I haven't tried that myself.

If all else fails, you have to look how DynaLoader does its magic on Win32.