: The string of characters you've provided looks like a hash or a unique identifier used by download managers or software updates. If the file has no extension (like .pdf or .zip), your operating system won't know which program to use to open it.
: Always run the file through an online scanner like VirusTotal before attempting to open it. Archivo de Descarga yyyyyyy666660BBAF4E60ED8E24...
: Right-click the file and select Properties (Windows) or Get Info (Mac) to see if there is any metadata about the "Type of file" or "Description". : The string of characters you've provided looks
If this was part of a specific download from a website, try to see if it completes with a proper name and extension. Archivo de Descarga yyyyyyy666660BBAF4E60ED8E24...