We can work with QuickBooks files in v2008 and newer, so the solution is for you to upgrade a backup copy (not your “live” file) to v2008 and send that to us.
QuickBooks has a particular upgrade pathway for old files. You can’t just upgrade straight to the new versions, it needs to be upgraded to particular versions. We don’t know why QuickBooks designed their products this way, but they have.
The 4 versions are available for download below. If your file is v6 or earlier, you need to upgrade via all 4. If your file is somewhere between v7 and v2008 you will only need to download those programs below that are newer than yours.