For past 24 hours only, I have been unable to open email attachments. v115.7.0, however last update was 31/01 and has worked perfectly until now. Still use Windows 10. Double clicking on attachments does nothing, other than popup software option for formats without specified defaults. Either way, no indication that attachment is opening. "Save as" is saving attachment document to target folder, however trying to open these errors, suggesting document is corrupted or in incorrect format. Have tried restarting system to no effect; likewise error continuing in troubleshoot mode. Cannot see any obvious settings that would impact this, nor have I consciously altered any of these. I'm certain this may be an easy fix, or my own error, but this is eluding me.