Because this is a multi-part RAR (indicated by .part1.rar ), you cannot extract the parts individually.

To extract the "solid content" from the multi-part archive sc24737-PCBS2v10109.part1.rar , you must treat the split volumes as a single continuous data stream. A "solid archive" is a specific compression method in WinRAR that bundles multiple files together to improve compression ratios, but it requires all parts to be present for successful extraction. How to Extract Multi-Part Solid Archives

Subfile in certain RAR cannot be read · Issue #373 - GitHub