diff --git a/src/qtgui/fragbuts.cpp b/src/qtgui/fragbuts.cpp
index d688cdf6..2b1fb075 100644
--- a/src/qtgui/fragbuts.cpp
+++ b/src/qtgui/fragbuts.cpp
@@ -36,6 +36,7 @@
 #include "recoll.h"
 #include "debuglog.h"
 #include "readfile.h"
+#include "copyfile.h"
 
 using namespace std;
 
@@ -147,6 +148,12 @@ FragButs::FragButs(QWidget* parent)
     m_fn = path_cat(theconfig->getConfDir(), "fragbuts.xml");
 
     string data, reason;
+    if (access(m_fn.c_str(), 0) != 0) {
+        // config does not exist: try to create it from sample
+        string src = path_cat(theconfig->getDatadir(), "examples");
+        src = path_cat(src, "fragbuts.xml");
+        copyfile(src.c_str(), m_fn.c_str(), reason);
+    }
     if (!file_to_string(m_fn, data, &reason)) {
 	QMessageBox::warning(0, "Recoll", 
 			     tr("%1 not found.").arg(
diff --git a/src/sampleconf/fragbuts.xml b/src/sampleconf/fragbuts.xml
index 2b3178b3..f804bef9 100644
--- a/src/sampleconf/fragbuts.xml
+++ b/src/sampleconf/fragbuts.xml
@@ -1,8 +1,14 @@
 <?xml version="1.0" encoding="UTF-8"?>
+<!-- Example file for configuring the "Query fragments" window.
+     Each <buttons> or <radiobuttons> element defines a lines of buttons
+     Each active button adds a query language fragment to the current query
+     before execution. 
+-->
+
 <fragbuts version="1.0">
 
   <radiobuttons>
-
+    <!-- Actually useful: toggle WEB queue results inclusion -->
     <fragbut>
       <label>Include Web Results</label>
       <frag></frag>
@@ -23,20 +29,29 @@
   <buttons>
 
     <fragbut>
-      <label>Year 2010</label>
+      <label>Example: Year 2010</label>
       <frag>date:2010-01-01/2010-12-31</frag>
     </fragbut>
 
     <fragbut>
-      <label>c++ files</label>
+      <label>Example: c++ files</label>
       <frag>ext:cpp OR ext:cxx</frag>
     </fragbut>
 
     <fragbut>
-      <label>My Great Directory</label>
+      <label>Example: My Great Directory</label>
       <frag>dir:/my/great/directory</frag>
     </fragbut>
 
   </buttons>
 
+  <buttons>
+
+    <fragbut>
+      <label>Check the manual (Query Fragments Window section) for explanations</label>
+      <frag></frag>
+    </fragbut>
+
+  </buttons>
+
 </fragbuts>
diff --git a/src/utils/copyfile.cpp b/src/utils/copyfile.cpp
index 9c93c2e5..0961072d 100644
--- a/src/utils/copyfile.cpp
+++ b/src/utils/copyfile.cpp
@@ -29,8 +29,9 @@
 #include "copyfile.h"
 #include "debuglog.h"
 
+using namespace std;
+
 #define CPBSIZ 8192
-#define COPYFILE_NOERRUNLINK 1
 
 bool copyfile(const char *src, const char *dst, string &reason, int flags)
 {
@@ -38,6 +39,7 @@ bool copyfile(const char *src, const char *dst, string &reason, int flags)
   int dfd = -1;
   bool ret = false;
   char buf[CPBSIZ];
+  int oflags = O_WRONLY|O_CREAT|O_TRUNC;
 
   LOGDEB(("copyfile: %s to %s\n", src, dst));
 
@@ -46,7 +48,11 @@ bool copyfile(const char *src, const char *dst, string &reason, int flags)
       goto out;
   }
 
-  if ((dfd = open(dst, O_WRONLY|O_CREAT|O_TRUNC, 0644)) < 0) {
+  if (flags & COPYFILE_EXCL) {
+      oflags |= O_EXCL;
+  }
+
+  if ((dfd = open(dst, oflags, 0644)) < 0) {
       reason += string("open/creat ") + dst + ": " + strerror(errno);
       // If we fail because of an open/truncate error, we do not want to unlink
       // the file, we might succeed...
@@ -143,18 +149,21 @@ bool renameormove(const char *src, const char *dst, string &reason)
 
 #include <string>
 #include <iostream>
-using namespace std;
 
 #include "copyfile.h"
 
+using namespace std;
+
 static int     op_flags;
 #define OPT_MOINS 0x1
 #define OPT_m     0x2
+#define OPT_e     0x4
 
 static const char *thisprog;
 static char usage [] =
 "trcopyfile [-m] src dst\n"
 " -m : move instead of copying\n"
+" -e : fail if dest exists (only for copy)\n"
 "\n"
 ;
 static void
@@ -177,6 +186,7 @@ int main(int argc, const char **argv)
         while (**argv)
             switch (*(*argv)++) {
             case 'm':	op_flags |= OPT_m; break;
+            case 'e':	op_flags |= OPT_e; break;
             default: Usage();	break;
             }
         argc--; argv++;
@@ -191,7 +201,11 @@ int main(int argc, const char **argv)
     if (op_flags & OPT_m) {
         ret = renameormove(src.c_str(), dst.c_str(), reason);
     } else {
-        ret = copyfile(src.c_str(), dst.c_str(), reason);
+        int flags = 0;
+        if (op_flags & OPT_e) {
+            flags |= COPYFILE_EXCL;
+        }
+        ret = copyfile(src.c_str(), dst.c_str(), reason, flags);
     }
     if (!ret) {
         cerr << reason << endl;
diff --git a/src/utils/copyfile.h b/src/utils/copyfile.h
index 6fdc469c..71ef8cfe 100644
--- a/src/utils/copyfile.h
+++ b/src/utils/copyfile.h
@@ -18,14 +18,23 @@
 #define _COPYFILE_H_INCLUDED_
 
 #include <string>
-using std::string;
 
-enum CopyfileFlags {COPYFILE_NONE = 0, COPYFILE_NOERRUNLINK = 1};
+enum CopyfileFlags {COPYFILE_NONE = 0, 
+                    COPYFILE_NOERRUNLINK = 1,
+                    COPYFILE_EXCL = 2,
+};
 
-extern bool copyfile(const char *src, const char *dst, string &reason,
+/** Copy src to dst. 
+ *
+ * We destroy an existing dst except if COPYFILE_EXCL is set (or we if
+ * have no permission...).
+ * A partially copied dst is normally removed, except if COPYFILE_NOERRUNLINK 
+ * is set.
+ */
+extern bool copyfile(const char *src, const char *dst, std::string &reason,
 		     int flags = 0);
 
-// Try to rename, copy/unlink source if this fails (different devs)
-extern bool renameormove(const char *src, const char *dst, string &reason);
+/** Try to rename src. If this fails (different devices) copy then unlink src */
+extern bool renameormove(const char *src, const char *dst, std::string &reason);
 
 #endif /* _COPYFILE_H_INCLUDED_ */