On Oct 18, 2012, at 4:04 AM, Jean Suisse wrote:
> Thank you for your reply. I am not familiar with the topic, but if I
> understand you correctly, what you say implies that :
>
> 1. The icon for the file type must be the same than the icon for the app.
> 2. If my app generates three files of different types for each record (e.g.:
> a setup file containing parameters, a raw acquired data file, a signature
> file), I can't have three different icons, one for each file
No, not at all.
A dozen different applications may be able to open and edit a certain file
type, but only *one* application on the system is designated as the default
handler for that file type. (It "owns" the file type in my prior lingo.) This
is the application that will launch and open the file if you double-click it in
Finder.
*That* application is the one responsible for supplying the icon for the file
type, not the application which created the file. In other words Acrobat and
Preview can both open and save pdf files, but Preview is the default handler
for pdf files on my system, so the system will show pdf files using Previews's
pdf file icon, even if I create a pdf file inside of Acrobat. If I set Acrobat
as the default handler, all pdf files would display using Acrobat's pdf icon.
However, there are exceptions to this.
1) You (or an application) can set a file to open with an application
other than the default handler for its file type, so it would not use the
default handling application's icon for that file type.
2) You (or an application) can set a custom file icon on a file, even
if it isn't the default handling application. So while Preview may be the
default handler for pdfs on my system, Acrobat could set a custom icon on the
file. When I double-click on it, it may still open in Preview, though unless
Acrobat did #1 and overrides the default to claim ownership for that *specific*
file.
So what I am saying is if your "Creator" application is creating ".jean" files,
but the "Viewer" application is the one set to be the default handler for .jean
files when they're double-clicked in Finder, then Finder will display .jean
files using the icon for the .jean file type that Viewer has in its bundle.
Creator's icon for .jean files will not be used.
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