HI,

I want to create .bin opening book in WinBoard 4.8 under WinXP SP3 32-bit. First I open .pgn file with games, and select "Save games to book" (the only book-related item in File menu). The dialog appears: "Book file exists. Try again to overwrite". I try again. After that I see the games in "Game list" window but no .bin file is created. Also, I see nothing in "Edit book" dialog, and "Edit" button is disabled too.
What am I doing wrong?

Any help will be apprecited.

I didn't find the right solution from the Internet.

References:
https://bit.ly/2MSo6dV
Cryptocurrency Solution Video

Thank you.