diff --git a/src/qtgui/rclm_view.cpp b/src/qtgui/rclm_view.cpp
index ecba10e3..cc2bab52 100644
--- a/src/qtgui/rclm_view.cpp
+++ b/src/qtgui/rclm_view.cpp
@@ -33,6 +33,7 @@
 #include "internfile.h"
 #include "rclmain_w.h"
 #include "rclzg.h"
+#include "pathut.h"
 
 using namespace std;
 
@@ -145,6 +146,9 @@ void RclMain::openWith(Rcl::Doc doc, string cmdspec)
     // Try to keep the letters used more or less consistent with the reslist
     // paragraph format.
     map<string, string> subs;
+#ifdef _WIN32
+    path_backslashize(fn);
+#endif
     subs["F"] = fn;
     subs["f"] = fn;
     subs["U"] = url_encode(url);
@@ -385,6 +389,9 @@ void RclMain::startNativeViewer(Rcl::Doc doc, int pagenum, QString term)
     // paragraph format.
     map<string, string> subs;
     subs["D"] = efftime;
+#ifdef _WIN32
+    path_backslashize(fn);
+#endif
     subs["f"] = fn;
     subs["F"] = fn;
     subs["i"] = FileInterner::getLastIpathElt(doc.ipath);
diff --git a/src/utils/pathut.cpp b/src/utils/pathut.cpp
index 9d39a5ef..7af30cbe 100644
--- a/src/utils/pathut.cpp
+++ b/src/utils/pathut.cpp
@@ -69,6 +69,14 @@ void path_slashize(string& s)
         }
     }
 }
+void path_backslashize(string& s)
+{
+    for (string::size_type i = 0; i < s.size(); i++) {
+        if (s[i] == '/') {
+            s[i] = '\\';
+        }
+    }
+}
 static bool path_strlookslikedrive(const string& s)
 {
     return s.size() == 2 && isalpha(s[0]) && s[1] == ':';
diff --git a/src/utils/pathut.h b/src/utils/pathut.h
index c8482955..e6b9e0cc 100644
--- a/src/utils/pathut.h
+++ b/src/utils/pathut.h
@@ -118,6 +118,7 @@ extern std::string path_pathtofileurl(const std::string& path);
 #ifdef _WIN32
 /// Convert \ separators to /
 void path_slashize(std::string& s);
+void path_backslashize(std::string& s);
 #endif
 
 /// Lock/pid file class. This is quite close to the pidfile_xxx