Dynamically change relative link extension from IPYNB to HTML when downloading as notebook as HTML?

[4D]

I currently have a line inside a notebook (File1.ipynb):

[File 2](File2.ipynb)

When downloading both the files as HTML, this link is hard-coded, and hence when I click on the link in the generated File1.html, it can't find the file, because it refers to ipynb and not to html.

I could try:

• using sed to replace all occurrences of ipynb with html
  
• hard-coding html inside the notebook, which will prevent me from using the links when I'm editing the notebook.
  

But, is there an alternative?

Is there, perhaps, a way to specify two links inside the notebook such that if the browser fails to find the first one, it'll try the second? I tried searching for such a method. I couldn't find it.

[Roland Weber]

How about giving the user a choice?

File 2: [html](File2.html) [ipynb](File2.ipynb)

[4D]

Good idea. Didn't think of that.