In Windows explorer, if I enable preview panelSumatra don't display any content.Error : preview not available
Tested with Sumatra 3.1.2 and Win 7 x64 Pro edition
Work fine as intended here on Win 7 x64, double checked by reinstall
Your version is 3.2.1 Pre-releaseI mention to be in 3.1.2I don't find this parameter in options
Especially for you I unistalled see "no preview" in right hand preview pane at topthen ran 64 bit 3.1.2 installer from https://www.sumatrapdfreader.org/download-free-pdf-viewer.html all works as expected
NOTE it only previews PDF not a "link" to a program such as VLC
OK works fine now.Annoying to not have this feature into Sumatra directly.If you forget to enable this option when install, you must re-download to do it.