: If you have already downloaded the file, do not open it. You can upload the file or the URL to VirusTotal to check it against dozens of antivirus engines.
: If this was part of a "long post" on a forum, check the comments or the user's history for "red flags" like spamming or deleted accounts. 57234.rar
If you have encountered a link to "57234.rar" in a suspicious post or email: : If you have already downloaded the file, do not open it