Here is a report based on the likely contents of a file with that name:

Anthropometry of Women of the U.S. Army - 1977. Report No. 5. Source: U.S. Army Natick Research and Development Command.

It provides detailed anthropometric data for human engineering design purposes.

This report contains data on body size measurements for women in the U.S. Army, covering 44 of 69 standard body measurements, plus workspace, head/face, and static strength measurements.

To view the contents of a .7z file, you will need software capable of extracting 7-Zip archives, such as 7-Zip on Windows or The Unarchiver on macOS.

Based on your request, "Girl 51.7z" appears to be a compressed archive file ( .7z ) containing a report regarding Army women's body measurements, likely from the 1970s.

Anthropometry of Women of the U.S. Army - 1977. Report No. 5

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