You can simply re-pack *.hqx files to *.zip archives either directly in a software that supports it, or you will have to first extract the original archive and compress the folder again to ZIP format.
Convert Macintosh BinHex archive to WinZIP Compressed ZIP archive.
We have found 4 software records in our database eligible for .hqx to .zip file format conversion.
Microsoft Windows software - convert hqx to zip on Windows
Another popular file archiver and compressor
Convert from hqx file format
The tables with software actions are a good pointer for what a certain program does with various file types and often may give users a good hint how to perform certain file conversion, for example the above-mentioned hqx to zip. However, it is not perfect and sometimes can show results which are not really usable because of how certain programs work with files and the possible conversion is thus actually not possible at all.
Apple macOS / Mac OS X software - convert hqx to zip on OS X
Mac version of the popular WinZip compression utility.
Mac version of the popular utility
A backup and archive utility