I have downloaded stacks before, but playing stacks in a plugin should
just load and run, and not be asking permission to write files to the
hard drive.
If the files needing to be written are just preference settings, then
the language of the warning should change. As it stands you could be
giving permission for the stack to completely fill up your drive with
large movie files or images.
I don't think that the plugin should insist on asking the user for
permission to load content from the web. After all, the stack itself
came from the web, so it's too late already! The way it is in
Shockwave works ok. If the content being loaded is from the same web
site, there is no warning, if it's from another web site, the user is
presented a dialog at the time of the reading of the data, and there
are three options to choose from. You can see that in action here:
http://xfiles.funnygarbage.com/~colinholgate/dcr/solarsystem.dcr
Click past the first screen, then click on the cartoon looking
element, and click in the 3D space to make a planet with that texture.
At that instant you get asked for permission. The actual texture
doesn't work, Cartoon Network removed that file long ago.
The way that Flash works with writing local content works well. Flash
can, by default, write up to 100k of local data without asking for
permission. The user can increase or decrease that at any time.
So, in coming up with the best ways to warn people, take a good look
at how it's done in Flash and Shockwave.
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