Sharepoint 2010 DateTimeControl Minute increment by 15 minutes, default is 5 minutes


1- I downloaded the code and when I am trying to open in VS 2010, I am getting
the message this Project canot load.

2- I installed the solution as a farm solution because I cannot deploy as a
sandbox solution, but when I am going to change the Minute in the
DateTimeByMinuteFieldTemplate.AXCS page, I am unable to save my change back and
gettign the access denied.

Can some one guide me on this-

1- How I can make change in the Minute and save back to this location
C:\Program Files\Common Files\Microsoft Shared\Web Server

2- How I can open the project in VS 2010, so I can run and create my own WSP in Sharepoint 2010.
2- Once deployed and manage to chnage the minute,how I can use this in my project.

Thank you so much for your help.