http://www.brutaldeluxe.fr/projects/cassettes/index.html has many of the old Apple Cassette programs on it’s site.
They are in wav file format compatible with playing them from your computer directly into your input port of your Apple II, Apple II+, and Apple IIe via the [LOAD and [RUN commands.
However, you can convert these wav files to .do images which can be played in an Apple II emulator such as Virtual II. I run Virtual II on my MacBook Pro.
The program you need is called CiderPress. It runs under Windows. I run Windows XP under Parallels on my MacBook Pro to perform these conversions.
The following are the sequence of pictures for creating the .do from .wav file.
As you can see from the pictures I didn’t spefically name any of the basic programs and just let the default From.Tape. However, on subsequent imports I name the program on one of the basic tracks…like Lunar, or Maze which are just two of the 20 or so files I’ve converted.