diff --git a/src/input_path.cpp b/src/input_path.cpp
index 287eaae..4e0f4e1 100644
--- a/src/input_path.cpp
+++ b/src/input_path.cpp
@@ -13,16 +13,10 @@
 
 // Everything but cygwin
 
-namespace quickbook { namespace detail
-{
-    void validate(boost::any& v,
-            const std::vector<std::string>& values,
-            input_path*, int)
-    {
-        std::string path
-            = boost::program_options::validators::get_single_string(values);
-
-        v = input_path(path);
+namespace quickbook {
+namespace detail {
+    fs::path native_to_path(fs::path::string_type const& path) {
+        return fs::path(path);
     }
 }}
 
@@ -36,15 +30,10 @@ namespace quickbook { namespace detail
 #include <windows.h>
 #include <sys/cygwin.h>
 
-namespace quickbook { namespace detail
-{
-    void validate(boost::any& v,
-            const std::vector<std::string>& values,
-            input_path*, int)
-    {
-        std::string path
-            = boost::program_options::validators::get_single_string(values);
-
+namespace quickbook {
+namespace detail {
+    fs::path native_to_path(fs::path::string_type const& path) {
+        // TODO: Use unicode version
 #if defined(BOOST_WINDOWS_PATH)
         cygwin_conv_path_t flags = CCP_POSIX_TO_WIN_A | CCP_RELATIVE;
 #elif defined(BOOST_POSIX_PATH)
@@ -56,6 +45,7 @@ namespace quickbook { namespace detail
         ssize_t size = cygwin_conv_path(flags, path.c_str(), NULL, 0);
         
         if (size < 0) {
+            // TODO: Better error.
             throw boost::program_options::validation_error(
                 boost::program_options::validation_error::invalid_option_value);
         }
@@ -67,7 +57,7 @@ namespace quickbook { namespace detail
                 boost::program_options::validation_error::invalid_option_value);
         }
 
-        v = input_path(result.get());
+        return fs::path(result.get());
     }
 }}
 
diff --git a/src/input_path.hpp b/src/input_path.hpp
index 3eeb2f4..51f29c5 100644
--- a/src/input_path.hpp
+++ b/src/input_path.hpp
@@ -10,35 +10,19 @@
 #define BOOST_QUICKBOOK_DETAIL_INPUT_PATH_HPP
 
 #include <boost/filesystem/v3/path.hpp>
-#include <vector>
-#include <boost/any.hpp>
 #include <string>
 
 namespace quickbook
 {
     namespace fs = boost::filesystem;
 
-namespace detail
-{
-    // Use this class with Boost.Program Options to convert paths to the format
-    // the Boost.Filesystem expects. This is needed on cygwin to convert cygwin
-    // paths to windows paths (or vice versa, depending on how filesystem is set
-    // up).
-    //
-    // Note that we don't want to convert paths in quickbook files, as they
-    // should be platform independent, and aren't necessarily relative to the
-    // current directory.
-
-    class input_path {
-        std::string path_;
-    public:
-        explicit input_path(char const* c) : path_(c) {}
-        explicit input_path(std::string const& c) : path_(c) {}
-        operator boost::filesystem::path() const { return boost::filesystem::path(path_); }
-
-        friend void validate(boost::any&, const std::vector<std::string>&,
-            input_path*, int);
-    };
-}}
+    namespace detail
+    {
+        // Convert paths from the command line, or other native sources to
+        // our internal path type. Mainly used to convert cygwin paths, but
+        // might be useful elsewhere.
+        fs::path native_to_path(fs::path::string_type const&);
+    }
+}
 
 #endif
diff --git a/src/quickbook.cpp b/src/quickbook.cpp
index e7346e2..1f300b1 100644
--- a/src/quickbook.cpp
+++ b/src/quickbook.cpp
@@ -186,11 +186,11 @@ main(int argc, char* argv[])
             ("no-pretty-print", "disable XML pretty printing")
             ("indent", value<int>(), "indent spaces")
             ("linewidth", value<int>(), "line width")
-            ("input-file", value<quickbook::detail::input_path>(), "input file")
-            ("output-file", value<quickbook::detail::input_path>(), "output file")
+            ("input-file", value<fs::path::string_type>(), "input file")
+            ("output-file", value<fs::path::string_type>(), "output file")
             ("debug", "debug mode (for developers)")
             ("ms-errors", "use Microsoft Visual Studio style error & warn message format")
-            ("include-path,I", value< std::vector<quickbook::detail::input_path> >(), "include path")
+            ("include-path,I", value< std::vector<fs::path::string_type> >(), "include path")
             ("define,D", value< std::vector<std::string> >(), "define macro")
         ;
 
@@ -255,9 +255,9 @@ main(int argc, char* argv[])
         
         if (vm.count("include-path"))
         {
-            std::vector<quickbook::detail::input_path> paths
+            std::vector<fs::path::string_type> paths
                 = vm["include-path"].as<
-                    std::vector<quickbook::detail::input_path> >();
+                    std::vector<fs::path::string_type> >();
             quickbook::include_path
                 = std::vector<fs::path>(paths.begin(), paths.end());
         }
@@ -270,13 +270,14 @@ main(int argc, char* argv[])
 
         if (vm.count("input-file"))
         {
+            // TODO: Convert cygwin paths
             fs::path filein(
-                vm["input-file"].as<quickbook::detail::input_path>());
+                vm["input-file"].as<fs::path::string_type>());
             fs::path fileout;
 
             if (vm.count("output-file"))
             {
-                fileout = vm["output-file"].as<quickbook::detail::input_path>();
+                fileout = vm["output-file"].as<fs::path::string_type>();
             }
             else
             {