The following are a few advanced topics ...
QACC_CODEC.MDB and it's 2 accompanying files (QACC_SHELLC.MDB and QACC_DATAC.MDB) are designed so they can be copied to another directory.
QACC_CODEC.MDB can then be renamed and modified as desired without affecting the original. (but don't change the name of QACC_SHELLC.MDB or QACC_DATAC.MDB unless you edit the source code in QACC_CODEC.MDB).
You can then experiment and safely make queries, forms, reports, add / change what's there, etc. however you want. You can use Access's wizards or create stuff manually.
This also allows us to update QACC_CODEC.MDB in the future without affecting work you have done.
Everything QACC_CODEC.MDB needs is integral to it (except QACC_SHELLC.MDB and QACC_DATAC). There are no registry entries, ini files, or anything else invisible that it depends on.