I downloaded the DocRecrypt tool to remove a password I forgot. Yet, when I open the DocRecrypt, the window opens for 1 second and then closes. (It flashes on and then closes.) Am I using this tool correctly?

Hi,

Make sure you downloaded it from Microsoft:

https://www.microsoft.com/en-hk/download/details.aspx?id=36443

For the steps to use Office DocRecrypt tool, you can refer to this link below:

https://technet.microsoft.com/en-us/library/jj923033.aspx

I'm not sure how you opened it, please note you need to use the DocRecrypt tool from the command line as introduced in the article.

By the way, please note this tool applies if you are an IT Professional looking to remove or reset passwords in Office 2013 files within your organization, for example if an employee has left the organization and you do not know the password. If you want information about passwords in a personal copy of Office 2013, this tool doesn't work for you.

Regards,

Melon Chen
TechNet Community Support