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.003 means this is the third piece of a larger file.

Use a checksum (like MD5 or SHA-256) if the source provided one, to ensure the file hasn't been tampered with.

When a file is too large to upload to a single location (like a forum or cloud storage), users "split" it into smaller pieces.

You cannot open this file by itself. To see the contents, you must have all parts (e.g., .001 , .002 , .003 , etc.) in the same folder and use software like 7-Zip or WinRAR to "Join" or extract them starting from the first part. Context: Russia-Ukraine Digital Archive