You can find how to use pli function $fsdbdump in debussy help document. You can compile and link the dll file using the source files provided by debussy.
if you use debussy version is less than 5.2, you can copy debussy/share/pli/nc/libpli.dll to /verilog/tools/bin and copy pli.lib to /verilog/lib. new you can use fsdbDumpfile and fsdbDumpvars to dump fsdb data directly.
If you don't need to use additional PLI, you are supposed to be able
to use the included novas.dll to dump fsdb file. Look for the document
in your installation.