If the source is unknown or untrusted, delete the file immediately. To give you a more accurate write-up, could you share: Where did you download this file from?
This is a RAR archive file , a compressed container format similar to a .zip file. It is used to bundle multiple files together or compress large files into a smaller size. You will need software like WinRAR or 7-Zip to open it. Archivo de Descarga rrf1tmaoodmk.rar
What was the of the download (e.g., a software installer, a document, an attachment)? If the source is unknown or untrusted, delete
Here is a general breakdown of what this file is and how to handle it securely: a software installer