.7z format specification — py7zr – 7-zip archive library

: Use the SHA or CRC checksum feature in 7-Zip to ensure the file hasn't been corrupted during download.

Because this is not a widely recognized public file, you should treat it with caution:

: Before opening, upload the file to VirusTotal to check for malware signatures across dozens of antivirus engines.

: The prefix "GEN" often stands for "Generic" or "Generated." Combined with "100MB," it suggests this may be a dummy file or a benchmark file exactly 100 megabytes in size, frequently used for testing network speeds or disk performance.

Could you clarify or what you expect it to contain (e.g., a driver, a game asset, or a data set)?