Nuget not copying content - deployment

Question

I am having a problem including a file i need in order for the project to work, here is the nuspec file that i have:
<?xml version="1.0" encoding="utf-8"?>
<package xmlns="http://schemas.microsoft.com/packaging/2011/08/nuspec.xsd">
<metadata>
<id>package_name</id>
<version>1.0.1</version>
<title>x Wrapper</title>
<authors>me</authors>
<owners>me</owners>
<requireLicenseAcceptance>false</requireLicenseAcceptance>
<description>package desc.</description>
<releaseNotes>Bugfix to exe not being copied.</releaseNotes>
<copyright>Copyright 2017</copyright>
<tags></tags>
<dependencies>
<dependency id="x.Common.Interfaces" version="1.0.0" />
<dependency id="x.Common.Logging" version="1.0.0" />
<dependency id="x.Wrapper.Common" version="1.0.0" />
</dependencies>
</metadata>
<files>
<file src="build\package_name.props" target="build\package_name.props" />
<file src="build\package_name.targets" target="build\package_name.targets" />
<file src="x.Wrapper\x.exe" target="content\x.exe" />
<file src="bin\Debug\package_name.dll" target="lib\net45\package_name.dll" />
</files>
</package>
When package is pushed and installed to nuget server there is only project dll + dependencies dll's but no other files are being copied into the project. Anyone with some more experience with nuget packages has idea on what could be going on ?