How to provide a custom implementation of open()?

[zpif]

I am putting a Zip file into my microcontroller's internal flash. I have then implemented mp_import_stat() and mp_lexer_new_from_file() to read from this Zip file (using miniz). This works fine, and I can now use "import" to read code from the Zip file.

Now I would also like to read plain files from this Zip file using open() and friends. Is there a similar hook function that I can implement?