Is it possible to create a text file from scratch?

I'm using a text file to keep a number that is used in controlled documents.

For example file contents can be: 17-154. So when we need to create a new controlled document it will be 17-155 and so forth.

All that works fine, but:

- What if the text file does not exist?

I would like to create a text file from scratch and write '17-001' to it...

Any ideas?

Thanks guys.