This is a simple notification that Windows Defender is an absolute pile of rubbish, in the event that anyone is unaware.
If it gives a report on ZQuest, or ZC, it's a false positive flag. We've tried many times to get MS to look into this, but their support form is broken, and they refuse to give it, or to give a damn about supporting non-paid developers.
if you use Windows Defender (why?) you will need to make manual exceptions for ZC, and to manually undelete it. This occurs in random sweeps that WD performs, and may or may not happen depending on your definitions, the phase of the moon, and the conjunction of the planets.
Here's why MS doesn't give a £&$* about whitelisting programmes such as ZC. We aren't the only ones with this issue.
Further, he is my report to MS, regarding their broken submission form. Nice response from them; eh?
t/l/d/r
Basically, there is no method of submitting a file as a developer, other than via this form; and the form has been broken for over a year. Reports that the form is broken, get responses telling people to use the form.
Scans of ZC, ZQuest, and the related content all pass on other scanners, including heuristic analysis done by a third-party analysis company. (You can submit files for analysis manually, to various companies, and we've done this.)
If you encounter this issue with any other scanner, please let us know so that we can attempt to get ZC white-flagged in their definitions. Most companies that specialise in security software actually care if their software is right. Microsoft do not, because it's in their interest to squish small developers, particularly open-source software developers, and non-commercial software.