On Sep 10, 2009, at 7:27 PM, Bill Williams wrote:

However my daughter, who uses a laptop PC, can't
seem to open attachments (JPG, TIFF, PDF), either compressed (zipped
w/ZipIt 2.2.2) or uncompressed.


Make sure the file is named with the proper 3 letter extension code. Macs don't require them, but Windows does. Without that 3 letter extension in the file name, the Windows machine will have no idea what the file is and will be unable to open it.

Also, although I can't say anything good or bad about ZipIt (never used it) you are aware that you can Zip files directly in OS X. It uses BomZip will will properly handle dual forked files if need be, but it is fully PKZip (zip format) compatible, so it can be unzipped using any Windows zip tool. To do this either right click (control- click for those with a single button mouse) on the file and choose "Compress" or "Make Archive" (depending on the version of OS X) and it will zip the file selected. You can also just select the file and go to the File menu and pick the same choice, but I'm a big fan of right clicking as it saves moving the mouse around (or in the case of my MacBook, two finger clicking, hold two fingers down on the trackpad and click the trackpad button and you will get the same event as if you control-clicked or right clicked... I also love two finger scrolling and find myself getting annoyed when I use an older Mac laptop that doesn't support it).

BTW, Chris, (since I see you're still helping w/e...@iler), how does one
compress with "Base 64" as Bea mentioned?

Base64 is an encoding method, not a compression method. In fact, it will have the opposite effect, it actually makes a file larger. It takes an 8 bit binary file and converts it into a pattern of 7 bit ascii text, this enables it to be attached to an email as email protocols know nothing about binary files and are only capable of sending data that can be typed on a keyboard.

If for some reason you have a desire to encode a file as Base64 there are tools to do it. Stuffit used to offer the feature, I'm not sure if it still does as I don't use Stuffit any more. However, there is little reason to ever encode a file as Base64 outside of things like email, and mail clients will have the ability built in to handle file attachments. NNTP or news service binary files may also be Base64 encoded, but same thing, better news readers will have the ability built in, or better have more efficient methods like Y-Enc built in.... NNTP I think is the only place I ever used to manually base64 encode files, and back then I used Stuffit to encode them, but that was because the version of Newswatcher I used to use didn't have support to do it for me automatically. I do occasionally have the need to base64 encode single strings of text, but I wrote myself a tool to do that (although there are plenty of tools already out there for the same purpose so I didn't need to, I just did it because it was quicker then my picking one I liked)

-chris
<www.mythtech.net>


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