In most cases, these strings are generated by file-hosting platforms to identify a specific upload. This could be anything from: Videos, music, or high-resolution images.
Because this specific alphanumeric string appears to be a unique file identifier rather than a known software or document, What is File nd8e96u6rxtw? Download File nd8e96u6rxtw
Before opening the file, upload it to VirusTotal to scan it against dozens of different antivirus engines. In most cases, these strings are generated by