Hello Ruth,
Sorry to be late to answer your question but there is something very important and it seems all people responding to your question forgot to ask you that
What version of Moodle are you using ?
This is very important because depending on your answer various advices given in that thread will work or not.
Here is my answer assuming you are using a recent version of Moodle (2.5, 2.6 or 2.7)
From the TestGen side
As other people have already pointed out you need to EXPORT (not Save) the quiz as a Blackboard
6.0-9.0 File.This will give you a zip archive
From the Moodle side
You need to choose "Blackboard" for the file format during import.
Note that Moodle import questions not quiz so you will need to add these questions to a quiz after import.
Things you must not do
- Don't try to do that with Moodle versions 2.0 to 2.3.2 the import is broken in these versions and there is absolutely no way to import blackboard files with these Moodle versions. You must upgrade your Moodle to a more recent version.
- Don't follow various tutorials found on the web that tell you to recode link to images in your questions. To is totally unnecessary. You have nothing to do if your questions contain images these images will be imported automatically
- Don't follow various tutorials found on the web that tell you to extract the .dat files from the .zip archive exported from TestGen. This is totally unnecessary and you risk to mess things if you do that. Import the zip archive directly. This is why the link given by Joseph is not recommended. Don't follow the advices given in http://eresource.npc.edu/forum/files/70dadffef44257ae2163314a1e6940f4-33.html this advices are outdated.