Fails to identify icon for HTML files

[end2endzone]

Describe the bug
ShellAnything fails to identify the icon for *.html files.

To Reproduce
Create a menu which shows the following icon:

<icon fileextensions="html" />

and the following error is displayed in the logs:

W0824 10:42:25.818912 23444 Icon.cpp:114] Failed to find icon for file extension 'html'. Resolving icon with default icon for unknown file type 'C:\Windows\system32\imageres.dll' with index '2'

Expected behavior
The icon for an HTML file should be the easiest to resolves.

Screenshots
N/A

Environment

• OS: Windows 10
• ShellAnything 0.10.0 master build from https://github.com/end2endzone/ShellAnything/tree/3db95a78e8d9bac149a846b5c06c32dd50ac310a

Additional context
Add any other context about the problem here.

[end2endzone]

The actual Win32Registry::GetFileTypeIcon() implementation resolves the icon to the following on my system: %ProgramFiles%\Internet Explorer\iexplore.exe,-17.

This is far from perfect. If should actually resolves to the Google Chrome icon.
EDIT: --> Moved to its specific issue. See issue #167

However, since the recent change to the implementation of Icon::IsValid(), introduced while fixing #150 (we previously had this implementation), icons with negative index are now reported as invalid icon.

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TODO:

• Duplicate test TestIcon.testResolveFileExtensionIcon() to also check for HTML file extension.