I it possible to add custom meta data to windows files like "archive" , "read-only" etc.?
Short answer: No, those attributes are built into the file system. You could maybe fake your own meta-data, with a little programming.
As Hugh said, NTFS has data streams, beware though, MS claims it "may not be supported in future file systems", and just that sentence is enough for me not to use that 'feature'.
(As a side-note, Winrar Archiver has the option to include the NTFS file streams when compressing files)
An alternative solution, that will involve programming: a system that stores the extra meta data in a file along-side the said files (think how Google Picasa stores it's .ini files along with your pictures).
Assuming your hard drive is formatted NTFS, you can use Alternate Data Streams to store any data or metadata you want, but it'll take a little programming. Alternate Data Streams are used by Explorer to store the info in a file's Summary tab of its property sheet (excluding Office files, which store the data internally).