When saving a package to a file in Toad by right clicking on the package in the Schema Browser Package Tab and selecting "Save To File | Save," the extensions ;pls and ;plb are added after .pks or .pkb.
WORKAROUND 1:
Manually delete the extensions after Toad creates the file.
WORKAROUND 2:
In TOAD | View Options | Files | General, edit the Package Body and Package file types to remove the spurious characters (":pls" and ";plb"). The package body and spec will be saved with only "pkb" and "pks" as in TOAD 9.0.
WORKAROUND 3:
Load the package and package body into the Editor and save the package and package body individually with the Save As Icon or File | Save As.
STATUS:
Waiting for fix in a future release of Toad for Oracle.