Thanks Peter, Zhichu and Syste I tried Peter's suggestion of renamining the gunzip file to unzip but got the output below. It didn't extract the cont-tmf.zip due to an invalid option but did continue on. So I tried Zhichu and Syste's suggestion and that worked great. Thank you all for your helpful suggestions. Best Wishes Keith McKay Hamilton, Scotland, UK.
texmfstart ctxtools --update CtxTools | updating F:/isoimage/usr/local/context/tex/texmf-local CtxTools | fetching cont-tmf.zip CtxTools | extracting cont-tmf.zip unzip: invalid option -- o unzip 1.2.4 (18 Aug 93) usage: unzip [-acdfhlLnNtvV19] [-S suffix] [file ...] -a --ascii ascii text; convert end-of-lines using local conventions -c --stdout write on standard output, keep original files unchanged -d --decompress decompress -f --force force overwrite of output file and compress links -h --help give this help -l --list list compressed file contents -L --license display software license -n --no-name do not save or restore the original name and time stamp -N --name save or restore the original name and time stamp -q --quiet suppress all warnings -S .suf --suffix .suf use suffix .suf on compressed files -t --test test compressed file integrity -v --verbose verbose mode -V --version display version number -1 --fast compress faster -9 --best compress better file... files to (de)compress. If none given, use standard input. CtxTools | remaking formats TeXExec | using search method 'kpsefast' TeXExec | updating file database TeXExec | using tex engine pdftex TeXExec | using tex format path F:/isoimage/usr/local/context/tex/texmf-mswin/web2c/pdftex TeXExec | generating tex format cont-en This is pdfTeX, Version 3.141592-1.40.0-beta-20060213 (Web2c 7.5.5) (INITEX) \write18 enabled.
<Very big snip of output> No virus found in this outgoing message. Checked by AVG Free Edition. Version: 7.5.467 / Virus Database: 269.6.2/785 - Release Date: 02/05/2007 14:16