TFS: Access to the path is denied

I want to download latest version from TFS 2012 to test the project is uploaded to source control successfully or not. When I run the project, an error is occurred.

After a while, I discover the file property of the project is read-only. Hence, access is denied.

Then, I just wonder why the project become read-only. It is because I haven't check out the project through TFS before the download. So, please remember to check out the project via TFS or just uncheck the read-only properties of the project.