John,This is a signature file that allows an assembly to be added to the GAC. The password for the signature file is "StrataFrame" without the quotes. When prompted, just enter the password. FYI, you will be asked for the password for each project (4 times). Once entered, you can rebuild the solution and it will be added to the GAC for you automatically.
Note: You may have to go through this step each time you download a new source code update.