The proper article for is "a" (e.g., "This is a BeingADIK-0.8.2-pc.part17.rar file").
The .part17 means this is the 17th segment of a larger split archive. You will likely need all previous parts (part01 through part16) and any subsequent parts in the same folder to successfully extract the game using software like WinRAR or 7-Zip . BeingADIK-0.8.2-pc.part17.rar
For the best experience and to support the developer, it is recommended to access the game through official platforms like Steam or the developer's Patreon. The proper article for is "a" (e