Likely indicates the project or topic (e.g., Screenshot, Sample, Subject, Secret). Jul: Indicates the month of July.

Use a file archiver tool like 7-Zip (Windows), The Unarchiver (Mac), or a command-line tool to extract the file.

Once extracted, you will be able to see the files and documents inside.

Likely an index number, item number, or day (e.g., the 10th item or July 10th).

If you can tell me or what type of project it relates to, I may be able to provide more context.