At one time, I thought I was the only one in the world to pay $100 each year to purchase the 101 hatch pattern library. I've since found a whole host of people that used to use this. Now the product (I assume the same) is free at hatchpatterns.com.
At any rate, the old way we used to add this, and still according to the readme, was to rename the AutoCAD .slb and .pat files and then copy these files from the creators of the custom hatch to that directory. The authors had taken all the newest ACAD hatch patterns and appended theirs to the end of the file in both cases. It was great.
Now that it's free, it hasn't evolved past 2000i. Since ACAD 2004 & 2005 don't use slide libraries (thought the .slb library is still there), you now can't view the custom hatch patterns. I'm also wondering what new hatches ACAD added between 2000i and 2005. If you use the old custom .pat file, then you are essentially missing any new hatch patterns.
The readme and the website both say that you can get another program to create your own slide libraries as an option.
I'm just wondering what other methods might be available that some of our ingenious AUGI members can think of or have tried?
I'm not sure I explained this in the best manner so ask if my post sounds too confusing!