Answer:

The Foxhound About page displays rroad1.dll or rroad164.dll for "Foxhound Windows API support DLL:"

• rroad1.dll means Foxhound is running on the 32-bit version of SQL Anywhere.

• rroad164.dll means Foxhound is running on the 64-bit version of SQL Anywhere.

See also...
How do I start Foxhound with the 32-bit version of SQL Anywhere when both the 32-bit and 64-bit versions of SQL Anywhere are installed?
What environment variables are used by Foxhound?