Set content files to "copy local : always" in a nuget package

I generate a nuget package from a project with this command in the post-build event. the variable %conf% is set to the right configuration (debug or release) and %1 is the project name (e.g. "MyCompany.MyProject").

nuget pack -Prop Configuration=%conf% "%1.csproj" -exclude *.sql -IncludeReferencedProjects

This package is for our own usage only, it will never be published on nuget. It ends in our private repository.

In the project, there is a file that is set to generate action : content and copy local : always. (My Visual Studio is in French, so I'm not 100% sure of the translation). Let's name it importantfile.xml.

In the generated package, I end up with this structure :

- content    - importantfile.xml- lib    -net45 (.NetFramework,Version=v4.5)        -MyCompany.MyProject.dll

Which is fine, I want importantfile.xml to be deployed in the package, because, well, this file is important!

When I install the package in another project, importantfile.xml is deployed at the root of the project. That's OK. But it is not set to copy local : always.

I need importantfile.xml to be copy local : always in this project where I install my package.

How can I achieve that?

Notes :

I can set copy local : always on the file just after installing the package, that's no big deal. I would live with it if later updates of the package would let this property as-is, which is not the case. When updating the package, copy local is reset to never (as stated here).

There's a nuspec file in the project's folder, here it is :

<?xml version="1.0"?><package ><metadata><id>$id$</id><version>$version$</version><title>$title$</title><authors>$author$</authors><owners>$author$</owners><requireLicenseAcceptance>false</requireLicenseAcceptance><description>$description$</description><copyright>Copyright 2014</copyright><tags>some random tags</tags></metadata></package>