New Post: Few errors in VS Express and SharpDevelop

Hi

I'm trying to create Office ribbon add-in with an installer.
I'm testing Visual Studio Express 2012 and SharpDevelop 5 Beta 3.

I needed to set Properties->Unblock on NetOffice Toolbox 1.2.zip before unzipping it.
Otherwise, Windows thinks that it is unsafe because it was downloaded from the web.

In a new office ribbon project I needed to use ToolsVersion="4.0" instead of 4 in MyAssembly.csproj

I need to run both VS and SharpDevelop as admin.

When trying to build the project in SharpDevelop I'm getting a warning:
Could not resolve this reference. Could not locate the assembly "extensibility, Version=7.0.3300.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a". Check to make sure the assembly exists on disk. If this reference is required by your code, you may get compilation errors. (MSB3245)

When trying to run the project in SharpDevelop 5 I'm getting:
Project is configured as dll and no execution command is specified.
You can specify an execution command in the project options.

How can I fix the errors?

Are there docs about this?
I couldn't find any info and had to figure it out.
Is there an example how to use SharpDevelop with wix (or something else) to create an Office add-in installer?

Thanks