hi, all versions of adobe windows 10 (dc, 11, 10, 9) when having preview pane enabled prevents deletion because being used explorer/preview host. happens on network files , not on local files. know can workaround disabling preview pane, cannot expect our users have every file need delete. there solution issue? we have tried repair, reinstall, different machine. same. possibly windows update has caused issue? thanks james. hi chrisl73164805, there isn't troubleshooting this, thing suggest check see if helps is- open pdf document > edit > preferences and see whether pdf thumbnail previews in windows explorer enabled or disabled? regards, akanchha More discussions in Acrobat Reader adobe