Explanation:

The rroad5_sa17_bin64.dll and/or rroad5_sa17_bin32.dll files may be missing from the Foxhound installation folder, or their Windows permissions may be set to prevent them from being loaded.

The message "Unable to read ... rroad5_sa17_bin64.dll" and/or "Unable to read ... rroad5_sa17_bin32.dll" will appear if Foxhound is unable to read the file.

The messages "Unabl to execute ... rroad5_sa17_bin64.dll" and/or "Unable to execute ... rroad5_sa17_bin32.dll" will appear if Foxhound is unable to call a procedure inside the file.

Try reinstalling Foxhound.

Here is where the files are installed by default on Windows 10:

C:\ProgramData\RisingRoad\Foxhound5

If you have created a custom installation for Foxhound here's what you can try:

• First, make sure that rroad5_sa17_bin64.dll and rroad5_sa17_bin32.dll are located in the same folder as the Foxhound database foxhound5.db.
• Second, stop and restart the Foxhound database to ensure the file can be loaded.
• Finally, use the DSN tab on the Foxhound main menu to connect to a database without getting the "Unable to..." message.

These files contain the very small but critical portion of Foxhound logic that had to be written in C.

See also...
How do I reinstall Foxhound?
How do I report unexpected errors and exceptions?