Oracle 10g to 9i - Data migration from higher version to lower

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or use the following link
http://dbataj.blogspot.com/2007/04/imp-00010.html

Also check the following article

SQL> SELECT PLATFORM_ID, PLATFORM_NAME, ENDIAN_FORMAT
2 FROM V$TRANSPORTABLE_PLATFORM;

PLATFORM_ID PLATFORM_NAME ENDIAN_FORMAT
----------- ------------------------------ --------------
1 Solaris[tm] OE (32-bit) Big
2 Solaris[tm] OE (64-bit) Big
3 HP-UX (64-bit) Big
4 HP-UX IA (64-bit) Big
5 HP Tru64 UNIX Little
6 AIX-Based Systems (64-bit) Big
7 Microsoft Windows NT Little
10 Linux IA (32-bit) Little
11 Linux IA (64-bit) Little