zachary83 Posted October 30, 2017 Share Posted October 30, 2017 I use Microsoft Project. When I open .mpp file, Project will show a warning message "Unknown error trying to lock file." Is there an alternative to Project? Quote Link to comment Share on other sites More sharing options...
Dex Posted October 30, 2017 Share Posted October 30, 2017 Where are you trying to open it from? Is it a shared file? Quote Link to comment Share on other sites More sharing options...
jcox3 Posted October 31, 2017 Share Posted October 31, 2017 OpenOfficeMPP Viewer Tool Google Docs LibreOffice Quote Link to comment Share on other sites More sharing options...
