This file is a split archive . To extract the contents, you must have all subsequent parts (e.g., part2.rar , part3.rar ) in the same folder.
Files named with this convention ( .part1.rar ) are often hosted on third-party file-sharing sites (Mega, MediaFire, Pixeldrain). Only open this if you trust the specific source where you downloaded it. Dawn_of_Grace.part1.rar
Generic "Game" or "Media" RAR files are common vectors for trojans or adware. This file is a split archive
If you have the file locally, you can check the "Comment" section in WinRAR or 7-Zip, which often contains the website or password required to extract the data. Do you have the other parts of this archive, or Dawn_of_Grace.part1.rar