Making disks appendable in Disk Utility question

Hi,
I found these notes about doing multiple burns on a disk (see below and it mentions changing the extention name to .img so that disk utility will give you the make disk appendable option.
I understand all that but my question is will this change the ability of the file to open in a new or old Mac (I have an old iMac G3 slot loading, PowerbookPC G4, and the new intel C2D 17"? My assumption is it will be fine in a new Mac but what about my older G3? I want to burn a disc and leave it appendable but am afraid by changing it to .img it won't open in the G3.
Thanks,
S.
1. Collect the material you want to burn in a folder on your Desktop. Open Disk Utility.
2. Select Disk>New>Disk Image from the Folder menu. Use the dialog box to navigate to the folder you have created on your Desktop, and select "Image." Name your new image, select a destination for the new file, and click "Save." Your file name should end in .img.
3. Back in Disk Utility, click the toolbar "Burn" button, navigate to the disk image you just created, selected, and click "Burn." Another dialog box will appear. Click the blue triangle but in the upper right hand corner. The dialog box will expand, giving you an additional selection of options. Click "Leave disk appendable," then click the "Burn" button to initiate the burn.
4. When you want to add a subsequent burn to that disk, repeat the process described above, but in the final dialog box, you will then see an "Append" button instead of a "Burn" button. This process can be repeated until there is no more free space left on the disk to create appended sessions.

Where is the tip of the week? When I clicked onto this site I saw it on the headline thing but then when I went into the archive of tips and to the top ones displayed I didn't see it.
I tried just using .dmg and then found another site that said to click burn then pop the disk in and then click the make appendable button but I was unable to do this as it was a faded grey colour and did nothing when I clicked on it.
S.

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I'm just learning this stuff, so your responses in basic terminology would be appreciated. (Instruct me as you would my grandson). I have two questions.
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The problem is that when I attempted to do this with
the new DVD (again, I have not installed the OS from
the DVD yet), the computer started up fine, but Disk
Utility ran for a minute or so, then gave me the
following message: "Disk Utility has lost its
connection with the Disk Management Tool and cannot
continue. Please quit and relaunch Disk Utility."
This happened twice in succession. I quit Disk
Utility (although it warned me that I could rended
the disk inoperable). The disk seems OK, but I don't
know what the problem is with DIsk Utility, or what
to do.
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Judy,
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