Native support is highly unlikely. Freddie Fish games (Humongous Entertainment, 1994–2002) were built for **Windows 95/98/ME/XP (16/32-bit)**. Vista 64-bit lacks the 16-bit subsystem (NTVDM) and has incompatible driver/audio architectures.
You must own the original game. Downloading ISOs/ROMs you don't own is piracy. ScummVM only provides the engine; you supply the data files from your discs.
Recommendation: Use ScummVM. It's purpose-built for exactly these games, runs perfectly on Vista 64-bit, and preserves the original experience.