Following are the most commonly asked questions about the innermost workings of Magnum Opus. If you ask a question which has not been covered
in these FAQs, then a new FAQ will be added, and you will be referred to it by return email.
Normally it is only Windows users who report this problem, and it is caused by an inappropriate setting in the Folder Options item
of the Control Panel. To correct this, select the View tab in Folder Options and make sure that the Hide extensions
for known file types check-box is not checked. This will allow the full name of MagnumOpus.jar to be displayed. You will then
find that the file is present and correct.
The executable file of Magnum Opus is MagnumOpus.jar
Such files (having a .jar
extension) will run on any computer which has
a Java Runtime Environment (JRE) installed. If it fails to run on your computer, it simply means that a your computer has not yet been equipped
with a JRE. You can easily get a copy by visiting the JAVA WEBSITE.
It's free, and only takes a couple of minutes to download and install.
This is a relatively common problem on Windows computers. It is caused by the association between .jar files and the program which runs
them having been hijacked by some other misbehaving program. There are several free software tools available which will heal this problem, and
one which has been found effective can be downloaded from
The answer to this question will depend on whether you are running the program on a Windows or Macintosh computer.
Macintosh: Simply use the Tasks/Print option on any Print screen. The Printer interface will present you with a Dialog
which contains a number of controls including a PDF drop-down menu. The Save as PDF... option will allow you to save the
PDF file in any desired location on your computer.
Windows:The recommended method is to install the Primo PDF program on your computer. You can download this program free
from a number of download sites ... just Google PrimoPDF and choose a suitable link. When installed, it operates as a virtual printer, but
instead of sending a puzzle to a printer, it sends it to a PDF file which you can locate anywhere on your computer's hard drive.
YES you can!
That is exactly what Magnum Opus is designed to do. And not only crosswords … you can also do Sudoku, Minesweeper, Acrostic,
Word-search, etc. a total of 23 different types of puzzle, with more to come in the future.
The interactive online versions of these puzzles are implemented by means of Java Applets. The Magnum Opus program provides Applet Export
options which create the on-line resources. All you need to do is upload those resources to your web server, and link them into your site,
and you will have working puzzles.
Please make good use of the program's Help system. That is the only way you will get all of the benefits provided by the program.
The program can be installed on any, or all computers at your school. All teachers and all students may use the program, and if they wish,
they can install it on their own personal computers both at school and at home.
There are three known causes for this effect:
Some web servers are case sensitive, so that a file called Puzzle.crossword is NOT the same as a file called puzzle.crossword
It is a very good idea to use ONLY lower case letters when naming files, and needless to say, you should also use lower case letters when
you refer to those files in the applet parameters.
All puzzle files (.crossword, .acrostic, .sudoku, etc) are binary files, not text files, and transfer of these files to the server
MUST be done in the binary mode. Failure to do so will lead to unpredictable results.
Some web servers place restrictions on the type of file which they will allow to be downloaded. Naturally, all servers will download
.html, .gif, .jpg, .zip, .class, .exe, etc files, but occasionally a server will be encountered which will not permit .crossword,
.acrostic, .sudoku, etc files to be downloaded. This is usually a configuration option which can be changed by the server administrator,
so if you run into this problem, your first action should be to discuss the matter with your Internet Service Provider. If they are
unwilling to make the necessary change, then you can change the name of the puzzle file (for example from puzzle.sudoku to puzzle.gif),
and also change its name where it is referred to in the applet parameters.