which o.s. supports file custom extended attributes?

I want to develop a cross-platform utility that works with custom or extended file attributes.

Do you know which commonly used Operating Systems support this feature ? Nee开发者_运维问答d that info:

• Windows which versions ?
• Mac OS, classic Mac or Mac OS X ?
• Linux "Distros" ?
• BSD ?
• Other (Solaris, Unix, other)

Any links ? Thanks.

---

I think depends your file system. customized extended attributes depend File System, so then I don't think you can get a cross-platform solution. NTFS on Windows, Ext on Linux they are totally different...