It may be a file from a peer-review portal where "753" is the submission or tracking number for a "Research Paper." Important Security Note
Because .rar files are containers that can hold any type of document (PDFs, datasets, or software), the specific contents depend entirely on the source. Based on common naming conventions in academic and technical repositories, "753_RP" could refer to: 753_RP.rar
A very small file (a few KB) may be a script, while a larger file is more likely to contain a legitimate document or dataset. It may be a file from a peer-review
The file appears to be a compressed archive, but it is not a widely recognized public academic article or standard citation format . 753_RP.rar
or a safe environment to extract the contents.