Question: saving large worksheets and reopening - data is not able to be re-continued

There is an option box that asks you if you wish to save the calculations for further manipulation when you re-open the worksheet.  Part of the worksheet has downloaded data from a webpage.  However when I re-open the worksheet and try to continue calculations, it's like I'm starting all over again. 

There was another mapleprimes post that mentioned you need to use the command save vars as a .m file.  But since this dialogue box comes up, I didn't think I needed to do that.  I am using Maple 12.  Does it not work in that version?

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