How to convert a directory of .zip files to .7z (7zip) in Windows
| for %%F in (*.zip) do ( "C:\Program Files\7-Zip\7z.exe" x -y -o"%%F_tmp" "%%F" * & pushd %%F_tmp & "C:\Program Files\7-Zip\7z.exe" a -y -r -m0=lzma2 -mx=9 -t7z ..\"%%~nF".7z * & popd & rmdir /s /q "%%F_tmp" ) |
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Found via Internet search. Bravo! Clean, simple and reliable.