Many RAR files are encrypted. Check the source where you found the file for a password. To help you better, could you tell me: Where did you download this from? Do you have all the other parts (part2, part3, etc.)?
That file name, september_7th.part1.rar , indicates it is [1]. To open it, you will need the rest of the parts (e.g., september_7th.part2.rar , part3 , etc.) located in the same folder [1]. september_7th.part1.rar
Ensure all files ( part1 , part2 , ..., partN ) are in the same folder [1]. Open Part 1: Right-click on september_7th.part1.rar [1]. Many RAR files are encrypted
To successfully extract the contents, you must download all parts ( .part1.rar , .part2.rar , etc.) [1]. etc.)? That file name