Proposal for CMakeLists.txt in /apps/openmw

gistfile1.cmake

# Config file for version
configure_file ("${CMAKE_CURRENT_SOURCE_DIR}/config.hpp.cmake" "${CMAKE_CURRENT_SOURCE_DIR}/config.hpp")

# Source files
file(GLOB_RECURSE OPENMW ${CMAKE_CURRENT_SOURCE_DIR}  "[^.]*.[ch]pp" "[^.]*.[ch]")
# Make the variable accessible for other subdirectories
set(OPENMW ${OPENMW} PARENT_SCOPE)

# Create source groups
file(GLOB LOCAL ${CMAKE_CURRENT_SOURCE_DIR} "[^.]*.[ch]pp" "[^.]*.[ch]")
source_group("apps\\openmw" FILES ${LOCAL})

file(GLOB DIRS ${CMAKE_CURRENT_SOURCE_DIR} "*")
foreach(dir ${DIRS})
    if(IS_DIRECTORY ${dir})
        file(RELATIVE_PATH dirname ${CMAKE_CURRENT_SOURCE_DIR} ${dir})
        if(dirname)
            # Create a source group for the subdirectory
            source_group("apps\\openmw\\${dirname}" REGULAR_EXPRESSION "^.*(${dirname}).*$" FILES ${OPENMW})
        endif(dirname)
    endif()
endforeach(dir)

# Main executable
add_executable(openmw
    ${OPENMW_LIBS} ${OPENMW_LIBS_HEADER}
    ${CONPONENT_FILES}
    ${OPENMW}
    ${APPLE_BUNDLE_RESOURCES}
)

I don't know if the source_group part works as I don't have a Windows box to test it on.