Fixed reading of the reading of the Read-Only file:
https://github.com/openscad/openscad/commit/18fa9a8bc6ac9eed47a8511bf94b500a5bc1745a
Also, Fixed the Test cases:
https://github.com/openscad/openscad/commit/4b59170abb14639da4e8b8eef9adf2cca075f428