PowerPoint does not natively provide a way to open password-protected
presentations. You might want to look at my free openppt.dll that allows you
to supply a password to open a password protected presentation. To use it
from Excel, you would have to create an instance of PowerPoint using
CreateObject() and pass the instance as the first parameter to the
OpenPresentation() function.

More information on openppt.dll is available at
http://officeone.mvps.org/openppt/

- Chirag

PowerShow - View multiple PowerPoint slide shows simultaneously
http://officeone.mvps.org/powershow/powershow.html

"juwen" wrote in message
...

How to open a password protected powerpoint file by Excel macro? by the
way,the cipher is known.

Is it possible to do this?

Thanks in advance,