64-bit versions of isql and bcp (isql64 and bcp64) are now available on all the UNIX and Windows platforms that Open Client and Open Server support.
In versions earlier than Open Server and SDK 15.5 ESD #9, only 64-bit isql.exe and bcp.exe are available on 64-bit Windows. If you have a script that references isql.exe or bcp.exe, and you intend to use the 64-bit version, you must change the reference in the script to isql64.exe or bcp64.exe.