nuget contentFiles: is a binary file instead of a text file - nuget

Question

Adding a binary file to the "contentFiles" of my nuget package leads to a build error in my C# project.
CSC : error CS2015: '...\0.0.14\contentFiles\any\any\archive.7z' is a binary file instead of a text file [...]
My goal is to have this binary file in my build output folder after dotnet build and dotnet publish.
details:
# .nuspec
<?xml version="1.0"?>
<package xmlns="http://schemas.microsoft.com/packaging/2010/07/nuspec.xsd">
<metadata>
...
<contentFiles>
<files include="archive.7z" flatten="true" buildAction="None" copyToOutput="true" />
</contentFiles>
</metadata>
<files>
<file src="content/archive.7z" target="contentFiles\any\any" />
</files>
</package>
# folder structure
├───content
│ └───archive.7z
└───.nuspec
# .csproj file
<ItemGroup>
<PackageReference Include="my-nuget-package-name" Version="0.0.14" />
</ItemGroup>

Answer 1

Be sure to add the path to contentFiles "any/any/archive.7z"
<files include="any/any/archive.7z" flatten="true" buildAction="None" copyToOutput="true" />
so the correct .nuspec file should look like this:
# .nuspec
<?xml version="1.0"?>
<package xmlns="http://schemas.microsoft.com/packaging/2010/07/nuspec.xsd">
<metadata>
...
<contentFiles>
<files include="any/any/archive.7z" flatten="true" buildAction="None" copyToOutput="true" />
</contentFiles>
</metadata>
<files>
<file src="content/archive.7z" target="contentFiles\any\any" />
</files>
</package>