Using normal Microsoft Office, you don’t need to enter any key, unless you have set a particular file to have a password.
The current version of OpenOffice reads Powerpoint files. So you shouldn’t have any problems. Just try it, and then ask about any problems you have. There is not 100% capability, so you may find the occasionally problem, but most files work fine without you doing anything.
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Using normal Microsoft Office, you don’t need to enter any key, unless you have set a particular file to have a password.
The current version of OpenOffice reads Powerpoint files. So you shouldn’t have any problems. Just try it, and then ask about any problems you have. There is not 100% capability, so you may find the occasionally problem, but most files work fine without you doing anything.