Many Thanks Amit. You made it easy for me. I also found this document on metalink: 818454.1 that might be of help to someone else. It discusses about "Finding Client Version, Instant Client Or Full Client". In this document they recommend to use dependencywalker.com (depends.exe) or Process Explorer (procexp.exe) that builds a hierarchical tree diagram of all dependent modules identifying if it is a 32 bit or 64 bit sqlplus. But the easiest way for me would be to download and install "file" equivalent for windows. Many thanks to one and all for the help. --Sundar ________________________________ From: oracle-l-bounce@xxxxxxxxxxxxx [mailto:oracle-l-bounce@xxxxxxxxxxxxx] On Behalf Of Amit Verma (IT - Otterbase) Sent: August 18, 2010 11:40 AM To: Mahadevan, Sundar; Harel Safra Cc: Oracle-L@xxxxxxxxxxxxx Subject: RE: How to check if my sqlplus client is 32 bit or 64 bit Download and install "file" equivalent for windows: http://gnuwin32.sourceforge.net/packages/file.htm C:\oracle\product\10.2.0\client_1\BIN>"C:\Program Files\GnuWin32\bin\file.exe" sqlplus.exe sqlplus.exe; PE32 executable for MS Windows (console) Intel 80386 32-bit HTH. ________________________________ From: oracle-l-bounce@xxxxxxxxxxxxx [mailto:oracle-l-bounce@xxxxxxxxxxxxx] On Behalf Of Mahadevan, Sundar Sent: Wednesday, August 18, 2010 11:07 AM To: Harel Safra Cc: Oracle-L@xxxxxxxxxxxxx Subject: RE: How to check if my sqlplus client is 32 bit or 64 bit I know this works for the database on unix side. Any ideas to check on windows client machine? Sorry for not being clear on my first mail. --Sundar ________________________________ From: Harel Safra [mailto:harel.safra@xxxxxxxxx] Sent: August 18, 2010 11:03 AM To: Mahadevan, Sundar Cc: Oracle-L@xxxxxxxxxxxxx Subject: Re: How to check if my sqlplus client is 32 bit or 64 bit cd $ORACLE_HOME/bin file sqlplus On Wed, Aug 18, 2010 at 5:58 PM, Mahadevan, Sundar <Sundar.Mahadevan@xxxxxxx<mailto:Sundar.Mahadevan@xxxxxxx>> wrote: Hi All, Greetings. I get "SQL*Plus: Release 10.2.0.4.0 - Production" when I do a sqlplus -V without any mention if it is a 32 bit client or 64 bit client. Appreciate any help. Thanks in advance. --Sundar