windows: fix check for already downloaded files
windows: fix check for already downloaded files

multipath-rtp/cerbero,brion/cerbero,lubosz/cerbero,nirbheek/cerbero,flexVDI/cerbero,freedesktop-unofficial-mirror/gstreamer__cerbero,EricssonResearch/cerbero,flexVDI/cerbero,sdroege/cerbero,atsushieno/cerbero,brion/cerbero,superdump/cerbero,shoreflyer/cerbero,freedesktop-unofficial-mirror/gstreamer__cerbero,freedesktop-unofficial-mirror/gstreamer-sdk__cerbero,fluendo/cerbero,AlertMe/cerbero,justinjoy/cerbero,freedesktop-unofficial-mirror/gstreamer__sdk__cerbero,ford-prefect/cerbero,davibe/cerbero,nirbheek/cerbero,GStreamer/cerbero,sdroege/cerbero,nzjrs/cerbero,BigBrother-International/gst-cerbero,AlertMe/cerbero,davibe/cerbero,atsushieno/cerbero,ford-prefect/cerbero,freedesktop-unofficial-mirror/gstreamer__sdk__cerbero,superdump/cerbero,ramaxlo/cerbero,nirbheek/cerbero-old,cee1/cerbero-mac,nirbheek/cerbero-old,justinjoy/cerbero,ylatuya/cerbero,freedesktop-unofficial-mirror/gstreamer__sdk__cerbero,freedesktop-unofficial-mirror/gstreamer__cerbero,EricssonResearch/cerbero,lubosz/cerbero,cee1/cerbero-mac,centricular/cerbero,justinjoy/cerbero,GStreamer/cerbero,flexVDI/cerbero,centricular/cerbero,EricssonResearch/cerbero,AlertMe/cerbero,jackjansen/cerbero,GStreamer/cerbero,shoreflyer/cerbero,ikonst/cerbero,shoreflyer/cerbero,multipath-rtp/cerbero,nirbheek/cerbero-old,freedesktop-unofficial-mirror/gstreamer-sdk__cerbero,ikonst/cerbero,AlertMe/cerbero,ford-prefect/cerbero,ikonst/cerbero,cee1/cerbero-mac,justinjoy/cerbero,freedesktop-unofficial-mirror/gstreamer-sdk__cerbero,cee1/cerbero-mac,brion/cerbero,ikonst/cerbero,centricular/cerbero,nirbheek/cerbero,centricular/cerbero,nzjrs/cerbero,fluendo/cerbero,multipath-rtp/cerbero,EricssonResearch/cerbero,brion/cerbero,GStreamer/cerbero,ramaxlo/cerbero,nirbheek/cerbero-old,lubosz/cerbero,flexVDI/cerbero,ylatuya/cerbero,nzjrs/cerbero,OptoFidelity/cerbero,ramaxlo/cerbero,atsushieno/cerbero,ylatuya/cerbero,superdump/cerbero,atsushieno/cerbero,multipath-rtp/cerbero,BigBrother-International/gst-cerbero,GStreamer/cerbero,shoreflyer/cerbero,fluendo/cerbero,freedesktop-unofficial-mirror/gstreamer-sdk__cerbero,flexVDI/cerbero,fluendo/cerbero,davibe/cerbero,nzjrs/cerbero,ylatuya/cerbero,ikonst/cerbero,ramaxlo/cerbero,ford-prefect/cerbero,multipath-rtp/cerbero,fluendo/cerbero,ramaxlo/cerbero,jackjansen/cerbero,sdroege/cerbero,jackjansen/cerbero,jackjansen/cerbero,BigBrother-International/gst-cerbero,sdroege/cerbero,freedesktop-unofficial-mirror/gstreamer__cerbero,sdroege/cerbero,BigBrother-International/gst-cerbero,superdump/cerbero,OptoFidelity/cerbero,lubosz/cerbero,EricssonResearch/cerbero,atsushieno/cerbero,centricular/cerbero,AlertMe/cerbero,brion/cerbero,BigBrother-International/gst-cerbero,freedesktop-unofficial-mirror/gstreamer__sdk__cerbero,davibe/cerbero,shoreflyer/cerbero,nirbheek/cerbero,OptoFidelity/cerbero,freedesktop-unofficial-mirror/gstreamer-sdk__cerbero,OptoFidelity/cerbero,nzjrs/cerbero