If you are referring to thumbnails in the Explorer - did you file a feature request at Microsoft already? Inkscape does not provide plugins for native file managers on any of the supported platforms.
Probably a duplicate of Bug #822178 “Thumbnail preview icons on Windows” <https://bugs.launchpad.net/inkscape/+bug/822178>
If you are referring to thumbnails in the Explorer - did you file a feature request at Microsoft already?
Inkscape does not provide plugins for native file managers on any of the supported platforms.
Probably a duplicate of Bug #822178 “Thumbnail preview icons on Windows” /bugs.launchpad .net/inkscape/ +bug/822178>
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