Do not attempt to extract Part 2 individually. Ensure all parts (Part 1, Part 2, etc.) are in one folder. Right-click Part 1 and select "Extract Here" to begin the process.
The prefix "sc25387" appears to be a specific internal tracking ID or a release tag. In many digital archival circles, these alphanumeric codes correspond to specific database entries for software, media, or scanned documents. Usage Recommendations
The .rar extension indicates it was created using WinRAR, a format known for high compression ratios and error recovery features.