how to use owncloud on windows server

Even if it's not suggested you can run ownlcoud scripts on your local windows server

go in /lib/private/util.php
and comment or remove near line 581:

/*
        if(OC_Util::runningOnWindows()) {
            $errors[] = [
                'error' => $l->t('Microsoft Windows Platform is not supported'),
                'hint' => $l->t('Running ownCloud Server on the Microsoft Windows platform is not supported. We suggest you ' .
                    'use a Linux server in a virtual machine if you have no option for migrating the server itself. ' .
                    'Find Linux packages as well as easy to deploy virtual machine images on <a href="%s">%s</a>. ' .
                    'For migrating existing installations to Linux you can find some tips and a migration script ' .
                    'in <a href="%s">our documentation</a>.',
                    ['https://owncloud.org/install/', 'owncloud.org/install/', 'https://owncloud.org/?p=8045'])
            ];
        } */