How to store preferences in file system on Windows?

I have 2 questions related to preferences using.
1. How to store preferences in file system (not in registry) on Windows? I see file system implementation of Preferences (java.util.prefs.FileSystemPreferences). But this implementation is linux-specific (use native methods). Does universal implementation exist?
2. How to store custom files in preferences? I need to store some user-specific files (XML files, for example) somewhere. These files are naturally user preferences. So my idea is to store it using Preferences. But it seems like there is no such posibility in standard preferences. I believe many peoples have the same problem. Does anyone have solution?
Please help me!
Thank you in advance.

Preferences is supposed to keep all this data
handling away from you, so you shouldn't bother. If
you'd like to write a file, just write a file. You
could create a "Settings" object and serialize it.I understand your reasonings. But unfortunately I have requirements to use file system preferences both on Linux and Windows. My bosses think there are many problems because of registry. Don't ask what problems, they didn't say. I cannot change their requirements. I must to implement it.
Maybe somebody already solved this proplem. I will very grateful for help.
Once again: simply write and read a custom file. Why
do you use Preferences at all costs when they don't
do what you want to?I have requirements to implement saving of files in the same manner as saving of preferences. It may be different code from Preferences. But it will be the best to have the same code if it possible.
Any way I believe the need to save user-specific files as preferences is quite widespread.

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