The .part3.rar extension indicates this is just one piece of a larger set. You cannot open or extract it without having all other parts (Part 1, Part 2, etc.) in the same folder.
Do you have the or the original name of the software or media this file is supposed to represent? E7GH7Y9UYC.part3.rar
Return to the forum post, thread, or index where you found the link; the description is usually listed there. they are likely suspicious.
If the parts are unusually small (a few KBs) or all identical in size, they are likely suspicious. E7GH7Y9UYC.part3.rar