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Recently happened. Not a big issue, but would like to know why and how it happened. Can it be removed. No known update to Windows or Adobe, but anything could have happened in the background. thanks.
Acrobat Reader recently updated. (It does this constantly and silently) Part of the change was a new icon.
As mentioned by TestScreenName that Adobe Reader has recently been updated and its a part of the update where the icon for application has been changed.
For more details what else has been updated, you may refer to the link- What's new in Adobe Acrobat DC