Check the Oracle Home & Client Version (32 bit- or 64 bit) installed on windows

======================================================================= Check the Oracle Home and Client and db installed in windows system
=======================================================================

Go to %ORACLE_HOME%\inventory\ContentsXML folder and open comps.xml file



Example : C:\app\Murthy\product\11.2.0\client_1\inventory\ContentsXML -- then find the "comps.xml file"  in the file you can see the following lines.
 

If you installed 64-bit client then you can see the following lines.
 

PLAT="NT_AMD64" then this Oracle Home is 64 bit.

If you installed 32-bit client then you can see the following lines.

PLAT="NT_X86" then - 32 bit.

You can install both 32-bit and 64-bit Oracle Home & Clients.