=== modified file 'src/ui/dialog/symbols.cpp'
--- src/ui/dialog/symbols.cpp	2015-04-27 23:38:31 +0000
+++ src/ui/dialog/symbols.cpp	2017-02-10 01:35:55 +0000
@@ -500,7 +500,14 @@
 
 #ifdef WITH_LIBVISIO
 // Read Visio stencil files
-SPDocument* read_vss( gchar* fullname, gchar* filename ) {
+SPDocument* read_vss( gchar* fullname, Glib::ustring name ) {
+
+  #ifdef WIN32
+    // RVNGFileStream uses fopen() internally which unfortunately only uses ANSI encoding on Windows
+    // therefore attempt to convert uri to the system codepage
+    // even if this is not possible the alternate short (8.3) file name will be used if available
+    fullname = g_win32_locale_filename_from_utf8(fullname);
+  #endif
 
   RVNGFileStream input(fullname);
 
@@ -523,6 +530,12 @@
     return NULL;
   }
 
+  // prepare a valid title for the symbol file
+  Glib::ustring title = Glib::Markup::escape_text(name);
+  // prepare a valid id prefix for the symbols (unfortunately libvisio doesn't give us a name)
+  Glib::RefPtr<Glib::Regex> regex1 = Glib::Regex::create("[^a-zA-Z0-9_-]");
+  Glib::ustring id = regex1->replace(name, 0, "_", Glib::REGEX_MATCH_PARTIAL);
+
   Glib::ustring tmpSVGOutput;
   tmpSVGOutput += "<?xml version=\"1.0\" encoding=\"UTF-8\" standalone=\"no\"?>\n";
   tmpSVGOutput += "<svg\n";
@@ -532,17 +545,10 @@
   tmpSVGOutput += "  version=\"1.1\"\n";
   tmpSVGOutput += "  style=\"fill:none;stroke:#000000;stroke-width:2\">\n";
   tmpSVGOutput += "  <title>";
-  tmpSVGOutput += filename;
+  tmpSVGOutput += title;
   tmpSVGOutput += "</title>\n";
   tmpSVGOutput += "  <defs>\n";
 
-  // Create a string we can use for the symbol id (libvisio doesn't give us a name)
-  std::string sanitized( filename );
-  sanitized.erase( sanitized.find_last_of(".vss")-3 );
-  sanitized.erase( std::remove_if( sanitized.begin(), sanitized.end(), ispunct ), sanitized.end() );
-  std::replace( sanitized.begin(), sanitized.end(), ' ', '_' );
-  // std::cout << filename << "   |" << sanitized << "|" << std::endl;
-
   // Each "symbol" is in it's own SVG file, we wrap with <symbol> and merge into one file.
   for (unsigned i=0; i<output.size(); ++i) {
 
@@ -550,7 +556,7 @@
     ss << i;
 
     tmpSVGOutput += "    <symbol id=\"";
-    tmpSVGOutput += sanitized;
+    tmpSVGOutput += id;
     tmpSVGOutput += "_";
     tmpSVGOutput += ss.str();
     tmpSVGOutput += "\">\n";
@@ -614,11 +620,14 @@
 
 #ifdef WITH_LIBVISIO
           if( tag.compare( "vss" ) == 0 ) {
+            // strip extension from filename and use it as name for the symbol set
+            Glib::ustring name = Glib::ustring(filename);
+            name = name.erase(name.rfind('.'));
 
-            symbol_doc = read_vss( fullname, filename );
+            symbol_doc = read_vss( fullname, name );
             if( symbol_doc ) {
-              symbolSets[Glib::ustring(filename)]= symbol_doc;
-              symbolSet->append(filename);
+              symbolSets[name]= symbol_doc;
+              symbolSet->append(name);
             }
           }
 #endif