RESX Manager always needs a Visual Studio solution file (*.sln) as a starting point. This can be from any version of Visual Studio, including the Express versions. Unfortunately, I have no express version installed, so I cannot test it, but it should work. If it doesn't work, please send me the Log-File, which will be written to "error.txt".
If you are looking for a tool, that integrates into the user interface of Visual Studio (Express), you will have to look for another tool, since there is no plugin of RESX Manager for Visual Studio, yet.
If you are looking for a tool, that integrates into the user interface of Visual Studio (Express), you will have to look for another tool, since there is no plugin of RESX Manager for Visual Studio, yet.