Is it possible to add custom metadata to file

Question

I know that each file has metadata like title, subject, keywords and comments:

but what if i need custom metadata like tags for example

is it possible to do it with C#?

Answer 1

I know that each file has metadata like title, subject, keywords and comments

That is not true. Most file types do not have a 'standard' form of metadata.

In particular, PDF files don't have properties that Windows Explorer recognizes.

Metadata (file attributes) is not a function of the filesystem.

• Office files use a structured format that allows for such attributes.
• Jpeg ues EXIF, a different format

Answer 2

If using NTFS you can store whatever you like in an Alternate data stream

Answer 3

This will depend on whether the file type you are working with supports this. For example this will not be possible with a text file.