If you are trying to open a file with this extension, it is part of a split archive:
The search for "piece covering 015.rar" indicates this is likely a , where 015.rar (or .part015.rar ) is the 15th segment of a larger file. Alternatively, it refers to a specific motorcycle accessory from Ilmberger Carbon . 1. Multipart Archive Segment 015.rar
The term "015.rar" also appears as a product code for high-end carbon fiber motorcycle fairings: Frame cover right Carbon - Honda CBR 1000 RR '17 If you are trying to open a file