OPW-00001: Unable to open password-file (10gR2)

C:\Documents and Settings\robin>orapwd file='D:\oracle\product\10.2.0\db_1\datab
ase\PWDocmdb.ora' password=h123456 entries=5;

OPW-00001: Unable to open password-file

Reason:

needn’t single quotes for the file.

D:\>orapwd file=D:\oracle\product\10.2.0\db_1\database\pwdocmdb.ora password=h12
3456

D:\>