extnd.nsf database does not contain documentation inside (using database, about database documents are empty). The database itself contains some documents, but they are some test data, but not a documentation.
In download zip package there is docs folder and there are two html files: welcome.html and index.html
When I open index.html, a frameset with API docs opens, but when I click on a hierarchy tree leaf at the left side, then nothing happens, right frame just displays infinite "loading" gif.
When I open welcome.html, there are the following links:
Ext 2.2 Samples - points to a non-existent local html-file which should be packaged too but it did not
We're working on these issues. Where did you download the code? We are getting a public github account set up soon so that we can centralize where the code is downloaded and so that the community that uses Extnd can have a one place stop for all of the latest. I just need to track down all of the places we have posted zip files of the code so that I can remove those and redirect users to the github account.