The quest-opened places and items directly on the ground got re-sealed when you deleted the world.x2 file from the save.
For the orc barrier, I recall someone tossed a teleporter through to get in, so that might be easier than using either the file swap or hex edit teleporting methods. Once inside you can just keep going until you clear that area, or exit and enter again with the teleporter stones.
There can be a slight gap where walls join in a north west corner, that you may be able to toss a teleporter stone through (ie you can talk to the mage Kistandalius from outside his shop, and see a bit of the interior). Unfortunately I did a quick check with Boratus' house, and if there is such a gap, it seems to be blocked by a stack of barrels in the north west corner of the room with the stairs down.
Whether you should try the file swap or hex edit teleporting depends on how much you want to complete that particular quest, how much you want to finish the game (if it is a required quest), and how adverse you are to starting over.
I can give you a world.x2 file from a save with Boratus' wall opened, the orc gate open and the herb / branch on the ground (placing this in a copy of your save should cause less problems that the default version that was used when you originally deleted the file).
Have you been to the warrior's guild yet? By the time I got to the warrior's guild (probably the best save to use) I had explored everything to the north of there in the Dark Forest.
