Acorn-specific usage instructions---------------------------------As zipfiles can come from a variety of sources apart from Acorn machines,consideration had to be given to the handling of dot-extensions, a laDOSFILE.TXT, unix-filename.tar.gz . What was decided that they wouldbe extracted as DOSFILE/TXT and unix-filename/tar/gz, and then truncatedto 10-characters, for FileCore compliance. This can quickly be alteredfor any new releases of FileCore that Acorn may make for longer filenames.Unfortunately, this means that you must be REALLY careful aboutextracting files from archives. The files    dummy_source.c and dummy_source.hwill both be extracted as    dummy_sourUnZip will prompt you for confirmation of the over-writing of these files,but you must be really careful unless you wish to lose files!Also, because UnZip is a unix-ported program, the filenames are CASESENSITIVE.    *unzip new/zip newfilewill extract 'newfile', but not 'NewFile', 'NEWFILE' or any othercombinations. However, you can use the -C option to force operationsto disregard the case of filenames.The Acorn UnZip port has an additional feature to cope with theextraction of files containing 'c' code. As you may be aware, AcornDesktop C requires all files called "foo.c" to be renamed to "c.foo",ie "foo" in a directory called "c".To cope with this, a colon-separated environment variable has beenset up called "Unzip$Exts". Any extensions found in this variable willbe extracted to directories named after the extension, with the extensionstripped. For example:    *Set Unzip$Exts "c:h:o:s"will extract all the files called 'foo.c' to a directory called 'c'.This can be used to include "c:h:o:s:txt" to pull all the text filesout to a separate directory.UnZip fully supports SparkFS Extra Field. This means that zipfiles createdwith SparkFS or Zip (on RISC OS) will be correctly unzipped, includingfiletypes.UnZipSFX can be used to create self-extracting archives. To use it, justcreate a common zipfile using Zip (or SparkFS), then load the UnZipSFXexecutable into an editor (eg. Edit, Zap), go with the caret the end of thefile (using CTRL-CursorDown) and drag the zipfile to the editor window (inother words, append the zipfile to the UnZipSFX executable). Now, saving theresulting file (with filetype Absolute (&FF8)), you have a self-extractingarchive (ie. double-clicking on it will unzip the contents of the originalzipfile to the currently selected directory).