It is pretty straight forward to access resources in a Windows Store App, however there are few questions I came across on MSDN forum which I tried to answer. 
A particularly interesting one was how to store resources inside RESW (Resource file) with a name like SubTokenOne.SubTokenTwo.SubToken.  From first glance it looks simple but there is a problem. If we try to retrieve this using SubTokenOne.SubTokenTwo.SubToken, it will not be return the value.

By digging deep I found that, inside ResourceMap it is stored with key -  SubTokenOne/SubTokenTwo/SubToken instead of SubTokenOne.SubTokenTwo.SubToken, so to retrieve this we have to replace every . with / while using ResourceLoader.GetString("SubTokenOne/SubTokenTwo/SubToken")
Example 

var resourceLoader = new ResourceLoader(); //A.Name.Header //A/Name/Header var string = resourceLoader.GetString("A/Name/Header");



Another question was how to get all resource strings inside RESW. We can just iterate ResourceMap and query whether we need. 

	    string resourNameToFind = "String2"; // Replace with name to find
            ResourceMap namedResourceMap = Windows.ApplicationModel.Resources.Core.ResourceManager.Current.MainResourceMap;
            foreach (KeyValuePair<string, NamedResource> resNameToNamedResourcePair in namedResourceMap)
            {
                if (resNameToNamedResourcePair.Key.EndsWith(resourNameToFind)) // Either check or just iterate.
                {
                    IReadOnlyList<ResourceCandidate> lstResCandidates = resNameToNamedResourcePair.Value.ResolveAll();
                    foreach (ResourceCandidate resCandidate in lstResCandidates)
                    {
                        string value = resCandidate.ValueAsString; // Value of actual resource string in resw.
                    }
                }
            }

 
And then finally - How to access the file which build action as "embedded resource"? 

This while return the Stream object using identifier as shown below (We will need to use - using System.Reflection for this to work)-

var stream = this.GetType().GetTypeInfo().Assembly.GetManifestResourceStream("APP_NAME.FOLDER_NAME.Logo3.png");

var stream = this.GetType().GetTypeInfo().Assembly.GetManifestResourceStream("TestApp2.Assets.Logo3.png");

and to get name of all embedded resources try this -

string[] names = this.GetType().GetTypeInfo().Assembly.GetManifestResourceNames();

See Also

An important place to find a huge amount of Visual C# related articles is the TechNet Wiki itself. The best entry point is
 Visual C# Resources on the TechNet Wiki