There is no official documentation for HyperFTP, but let me explain a little about the various transfer modes that it uses for sending files.
ASCII mode sends only the data fork of the file. The Standard Open dialog only shows TEXT files because other types of files could contain binary information that would not transfer correctly in ASCII mode.
Binary mode also sends only the data fork but it lets you send any file. The data fork is sent without translation but the resource fork and Finder information are lost.
BinHex can send any file and includes the data and resource forks as well as the Finder information. It encodes the file into all printable characters so the results can be included in a mail file or whatever.
MacBinary can also send any file. The data and resource forks and the Finder info are sent in untranslated binary so it's very fast and effecient but some hosts may have trouble with it.
NCSA Telnet has a MacBinary FTP server built in so it is possible to send files from one Mac to another with Telnet and HyperFTP.
Finally, you must have HyperCard 2.0 or later to use it.
