Hi Denis,

At least for the nonce, what I'd recommend doing is not having any
a20.idx files at all. Guide can still access the A2.0 data; it will
simply binary-search the entire file, rather than using the index to
reduce the area to be binary-searched.

If the A2.0 files are on CD or DVD, that can slow display a bit.
On hard drives, it just doesn't matter very much. It should at least
let you get things going until I post a version that looks for a20.idx
in the same folder as the data.

-- Bill