Given the naming convention, this "piece" likely contains one of the following for the BBRR-20 series:
: 3D design files (e.g., STEP or DWG) used by engineers to integrate the battery rack into data center layouts. bbrr-20_11.7z
If you are looking for the software to open this file, you can use the official 7-Zip utility . Please note that to extract the contents, you generally need of the archive (e.g., pieces 1 through 11) in the same folder. Given the naming convention, this "piece" likely contains