Npri_alpha045.part1.rar -

You cannot extract the contents of Npri_alpha045.part1.rar without the subsequent parts ( .part2.rar , .part3.rar , etc.).

Knowing these details will allow me to provide specific instructions. Npri_alpha045.part1.rar

Because RAR files can contain executable code, it is important to handle files from unknown sources with care. You cannot extract the contents of Npri_alpha045

Understanding Npri_alpha045.part1.rar: A Guide to Multi-Part Archives Npri_alpha045.part1.rar