Is this alert a change with a recent update to definitions?
If so, you might want to either sit tight for a bit, or go to the security
portal at
www.microsoft.com/security/portal and download the latest defs
there. See if they are newer than what you have--and re-test. If this is a
false-positive, Microsoft is usually quite responsive about fixing the
issue.
You could also check the details of the finding--I.e. what precise file is
involved, and submit that file to virustotal:
www.virustotal.com
and see what they say about it.
What is the name of the threat as detected by Windows Defender?
You may be able to look that up in the reference to threats available at the
security portal--and see whether the description makes any sense in relation
to the application you have.