What are the locations that Start10 and Start11 search for programs from?

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When I type "note" in the start search bar, it gives me 2 options:

1. StickyNote

2. OneNote

I would expect it to also return

3. notepad

4. notepad++

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Notepad is installed in a standard windows location, and is only returned if I type out the whole word "notepad", in which case it shows "notepad.exe"

Notepad++ is only shown if I type out "notepad++" completely.

My notepad++ installation, which is on a different drive: (for example, instead of C:\program files, its installed under e:\Apps).

Is there a way to specify the types of files that Startxx indexes (lnk,exe,bat,com) or the locations that it indexes?  

I did read a post that suggested to "pin" the app to the start bar.  This is impractical with hundreds of applications installed.  

All of my applications are in indexed locations by windows, with their file types and locations explicitly added.