: The course is also available as a ChessBase FritzTrainer , which provides the integrated video and PGN files in a standard format.

If you already have the other parts (e.g., .002, .003) but are missing only the first "piece," the archive will not open. 7-Zip requires to be in the same folder to extract the data. If you downloaded these from a legitimate source and one part is corrupted or missing, it is best to redownload the entire set from your account's purchase history on the official site to ensure version compatibility.

To ensure you have a complete and functional set of files, you should use official platforms where the course is hosted and supported:

: Some of his content is featured on Modern Chess , which offers digital downloads for various grandmaster repertoires. Technical Note on .001 Files

The "Killer Alekhine" is a video repertoire for Black in the Alekhine Defense, authored by (also known as GingerGM). Because the course contains high-quality video content, it is often distributed in split archives (e.g., .001, .002, .003) to handle large file sizes. Where to Find the Course