Anytime a Project is saved in the MSProject 2010 .mpp format (yes it's different than the 2007 .mpp format), I receive an error when opening with Open Project. "Serena OpenProj Error" "Failed to Read File".
I have no issues opening Project 2007 .mpp format. I've attached a new blank project 2010 file as a test/example.
Test new-blank Project 2010 file
I have the same issue with Project 2010 files.
Confirmed, same issue. Project 2007 files also work fine.
openproj 1.4 was released in October 2008. Since Microsoft Project 2010 was not released at that time and the file format is different, then the results you are getting should be expected. I am working on a new release that will, at the very lease, read Project 2010 .mpp files.
Any indication as to when the new release will be available?