a quik ? about file embedding

I know it is possible to embed a texture file as part of a blend, I’ve done it. But how do you get rid of it?
Here is what is happening;
I made a blend with a png as a texture, embedded in it.
Now I want to use parts of that blend in another project. I have deleted the material and texture to come up with another color scheme. (blank as of yet)
I open the blend on another computer and try to save changes in it. And get an error that the embedded file cant be found, (it’s not on this computer)

How do you take an embedded file (or request for one) out of a blend?

File / External Data / Unpack Files
or

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Thanks Richard,
So simple! But when you are searching so hard it impossible to see the forest for all the trees!
Mike