Being the same program it should be able to open them ...but sometimes this is not a rule ...(same thing with word files from 2003 in 2007 program ) try to associate the files with the new program and see if it works and open them ..for example ..right click on one of the files and choose properties...after that click change and from the list pick the new program ...If it isnt in the list ..click browse and go to drive C /program files..choose the new program folder and inside click on the execution ...after you make this choice ..click apply ..and ok ..
If the files are visible in this new version it will open them and you will be able to read them ..if they are incompatible it will tell you so ..
In this case the only way to do it is to install the old version in parallel.To avoid conflict ..install the old version in a separate director folder..in another partition ...Just choose to change the director when you install ..and make a folder in the other partition ..name it after the program ..and choose it to install the program into ..when you are done ..make the same thing I already told you to do with this one ...click right on a file ..and properties than change and browse for the old version ..and choose its execution to open the old files..
This way they will work in parallel
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