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PATH Java Developer Documentation
> Mac OS Runtime for Java
> MRJToolkit
> Programming With MRJToolkit
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At times you might want to save files to a Mac OS disk drive from your Java application (such as a text document or a preferences file). While saving files to the Mac OS platform is simple, accessing them afterwards can be more problematic, since files created by a Java application do not normally contain any Mac OS-specific information and therefore cannot be assigned a custom desktop icon. A plain file without a custom icon offers the user no clues as to what application created the file or what its contents may be. Attempts to open such a file from the Mac OS Finder (the system application that manages files and the desktop) may not work, since the Finder does not know which application it should use to open it.
To solve this problem, MRJToolkit allows you to assign special Mac OS identifiers to files saved from Java applications. You can then open or search for such files just as you could from a Mac OS application. MRJToolkit also allows you to search for specific applications or special folders (such as the Preferences folder).
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