Use the code from kedaman and the added piece by myself.
Change your label caption to read. "Click here to open file" or whatver your instructions would be.

Then put your code for open excel in the label click event with my code and away you go.

As you have it you are firing off a blink and opening a file and telling it to stop blinking when you open. It's all happening at once. I can't see how it will blink when you open at the same time.