If 061314826.upd is a file you downloaded from an untrusted website or an unexpected email attachment, . Update files are a common vector for malware. Scan the file with Windows Defender or VirusTotal before any action.
The update likely only changes the "diff" (specific code differences), making the download much smaller than the original file. 061314826 upd
To narrow down what this code means for you, check the following: If 061314826