How does ABC spell check show up everywhre?

After I had Chrome install its ABC Spell Cheker into Chrome I noticed that the spell checker shows up for non-google programs as well.  If I'm composing an email in my Yahoo email client, for example, and I select some text I've written and right-click, there's ABC Spell Check waiting in the context menu   to spell check the text I've selected.  Same thing if I'm typing an email in Outlook.  Or entering text into the Squarespace editor while I work on a Squarespace website.  This is all wonderful, but I'm wondering how Google installed Spell Check in a way that it shows up in the context menu for all these -non-google programs.

Thanks for any info.
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Dr. KlahnPrincipal Software EngineerCommented:
They hooked the file extensions for common filetypes and they also added context menu items to other programs.  This is all easily done in the Registry at install time.

Ethically, there should have been a plain and clear option that asked if you wanted this done -- perhaps there was, but you missed it in a "custom install" option or some other obscure option.

You can get these context menu items out, but it means going in and editing the Registry by hand, which is a very touchy job.  The slightest mistake could have severe consequences system-wide.  The safest options are
(a) live with it
(b) remove Chrome completely using an aggressive uninstaller such as Revo, reinstall Chrome, and don't install that addon again.  Simply uninstalling that add-on may not clean up the Registry to its before-the-fact state.

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