Even on a 64-bit Windows OS, a 32-bit application (like IBExpert or older versions of Microsoft Office) requires the 32-bit fbclient.dll .
To avoid security risks and compatibility issues, you should always download Firebird files from the Official Firebird Project Website. Since Firebird 2.5 has reached its official end-of-life, it is listed under the Discontinued Versions section. fbclient.dll firebird 2.5 download
A common point of confusion is whether to use the 32-bit or 64-bit version of the DLL. The rule is simple: . Even on a 64-bit Windows OS, a 32-bit