I have been using version 5.2 and now I would like to move up to vers 7. However I have 4mpl files all created from vers.5.3 the largest one is 248mb however it will not open in Maple vers 7. The others convert and open just fine this one though it asks and then just says maple experienced an error trying to open the file. I tried mconvert but there is no documentation on that tool and when try to run it errors with could not open midas.dll?? What can I do to get the last mpl working so I can make a full leap to ver 7? Thanks.