MozReview-Commit-ID: 64hU21BgELu
Some third-party software tampers with the registry settings for the
IAccessible COM interface which is provided by Windows. If these settings
become corrupted, our a11y implementation breaks. We attempt to detect this
by loading the path to the IAccessible typelib and checking to see if that file
still exists. If it is missing, we reset the typelib GUID and version to the
system default.
The GUIDs and version number included in this patch hold from Windows 7 through
to Windows 10 Anniversary Update. The Windows 10 Creators update does not use
a typelib anymore, so we do nothing in that case. This fix is intended to run
on 32-bit builds only.
f3f43946b3