I have 2 files in My Drive with
One is marked as
Unknown file type and has a blue icon, and the other is marked as
How do I change both to be
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An identical question has been asked on StackOverflow - .ipynb file in Google Drive doesn't open with Colaboratory by default. The accepted answer by @JeffRush can be summarised as follows:
"If you want to get that icon you should save a copy from Colab"
His detailed answer includes an explanation of the steps to do this.