diff --git a/docs/examples/smtp-mime.c b/docs/examples/smtp-mime.c
index a467535a9..2895dbc31 100644
--- a/docs/examples/smtp-mime.c
+++ b/docs/examples/smtp-mime.c
@@ -153,6 +153,9 @@ int main(void)
      * clean up in the end.
      */
     curl_easy_cleanup(curl);
+
+    /* Free multipart message. */
+    curl_mime_free(mime);
   }
 
   return (int)res;
diff --git a/docs/libcurl/curl_mime_filedata.3 b/docs/libcurl/curl_mime_filedata.3
index fcd86cc18..71562edd0 100644
--- a/docs/libcurl/curl_mime_filedata.3
+++ b/docs/libcurl/curl_mime_filedata.3
@@ -35,7 +35,6 @@ contents.
 \fIpart\fP is the part's to assign contents to.
 \fIfilename\fP points to the nul-terminated file's path name. The pointer can
 be NULL to detach previous part contents settings.
-If \fIfilename\fP is "-", part contents data will be read from stdin.
 Filename storage can be safely be reused after this call.
 
 As a side effect, the part's remote file name is set to the base name of the
diff --git a/lib/formdata.c b/lib/formdata.c
index 129086dee..b7ea21c8c 100644
--- a/lib/formdata.c
+++ b/lib/formdata.c
@@ -897,7 +897,10 @@ CURLcode Curl_getformdata(struct Curl_easy *data,
           clen = -1;
 
         if(post->flags & (HTTPPOST_FILENAME | HTTPPOST_READFILE)) {
-          result = curl_mime_filedata(part, file->contents);
+          if(!strcmp(file->contents, "-"))
+            result = Curl_mime_file(part, stdin, 0);
+          else
+            result = curl_mime_filedata(part, file->contents);
           if(!result && (post->flags & HTTPPOST_READFILE))
             result = curl_mime_filename(part, NULL);
         }
diff --git a/lib/mime.c b/lib/mime.c
index 11d387d62..9e1336475 100644
--- a/lib/mime.c
+++ b/lib/mime.c
@@ -634,8 +634,18 @@ static int mime_part_rewind(struct Curl_mimepart *part)
     targetstate = MIMESTATE_BODY;
   if(part->state.state > targetstate) {
     res = CURL_SEEKFUNC_CANTSEEK;
-    if(part->seekfunc)
+    if(part->seekfunc) {
       res = part->seekfunc(part->arg, part->origin, SEEK_SET);
+      switch(res) {
+      case CURL_SEEKFUNC_OK:
+      case CURL_SEEKFUNC_FAIL:
+      case CURL_SEEKFUNC_CANTSEEK:
+        break;
+      default:
+        res = CURL_SEEKFUNC_FAIL;
+        break;
+      }
+    }
   }
 
   if(res == CURL_SEEKFUNC_OK)
@@ -907,9 +917,6 @@ CURLcode curl_mime_filedata(struct Curl_mimepart *part, const char *filename)
   if(!part || !filename)
     return CURLE_BAD_FUNCTION_ARGUMENT;
 
-  if(!strcmp(filename, "-"))
-    return Curl_mime_file(part, stdin, 0);
-
   if(stat(filename, &sbuf) || access(filename, R_OK))
     result = CURLE_READ_ERROR;
 
diff --git a/src/tool_formparse.c b/src/tool_formparse.c
index cf19c0508..fc5162eed 100644
--- a/src/tool_formparse.c
+++ b/src/tool_formparse.c
@@ -347,6 +347,21 @@ static int get_param_part(struct OperationConfig *config, char **str,
   return sep & 0xFF;
 }
 
+/* Check if file is "-". If so, use a callback to read OUR stdin (to
+ * workaround Windows DLL file handle caveat).
+ * Else use curl_mime_filedata(). */
+static CURLcode file_or_stdin(curl_mimepart *part, const char *file)
+{
+  CURLcode ret = CURLE_OK;
+
+  if(strcmp(file, "-"))
+    return curl_mime_filedata(part, file);
+
+  return curl_mime_data_cb(part, -1, (curl_read_callback) fread,
+                           (curl_seek_callback) fseek, NULL, stdin);
+}
+
+
 /***************************************************************************
  *
  * formparse()
@@ -547,9 +562,9 @@ int formparse(struct OperationConfig *config,
         }
 
         /* Setup file in part. */
-        res = curl_mime_filedata(part, data);
+        res = file_or_stdin(part, data);
         if(res) {
-          warnf(config->global, "curl_mime_filedata failed!\n");
+          warnf(config->global, "setting file %s  failed!\n", data);
           if(res != CURLE_READ_ERROR) {
             if(subparts != *mimecurrent)
               curl_mime_free(subparts);
@@ -619,9 +634,9 @@ int formparse(struct OperationConfig *config,
         }
 
         /* Setup file in part. */
-        res = curl_mime_filedata(part, data);
+        res = file_or_stdin(part, data);
         if(res) {
-          warnf(config->global, "curl_mime_filedata failed!\n");
+          warnf(config->global, "setting file %s failed!\n", data);
           if(res != CURLE_READ_ERROR) {
             Curl_safefree(contents);
             return 22;
diff --git a/src/tool_setopt.c b/src/tool_setopt.c
index 4e25e9e12..19646ea69 100644
--- a/src/tool_setopt.c
+++ b/src/tool_setopt.c
@@ -450,9 +450,11 @@ static CURLcode libcurl_generate_mime(curl_mime *mime, int *mimeno)
             filename = part->filename;
         }
         break;
-      case MIMEKIND_FILE:
-        /* Can only be stdin in the current context. */
-        CODE1("curl_mime_file(part%d, \"-\");", *mimeno);
+      case MIMEKIND_CALLBACK:
+        /* Can only be reading stdin in the current context. */
+        CODE1("curl_mime_data_cb(part%d, -1, (curl_read_callback) fread, \\",
+              *mimeno);
+        CODE0("                  (curl_seek_callback) fseek, NULL, stdin);");
         break;
       case MIMEKIND_DATA:
 #ifdef CURL_DOES_CONVERSIONS
diff --git a/tests/data/test173 b/tests/data/test173
index 865ef7ba2..754950105 100644
--- a/tests/data/test173
+++ b/tests/data/test173
@@ -53,9 +53,11 @@ POST /we/want/173 HTTP/1.1
 User-Agent: curl/7.12.1-CVS (i686-pc-linux-gnu) libcurl/7.12.1-CVS OpenSSL/0.9.6b ipv6 zlib/1.1.4 GSS libidn/0.4.6
 Host: %HOSTIP:%HTTPPORT
 Accept: */*
-Content-Length: 360
+Transfer-Encoding: chunked
+Expect: 100-continue
 Content-Type: multipart/form-data; boundary=----------------------------5dbea401cd8c
 
+168
 ------------------------------5dbea401cd8c
 Content-Disposition: form-data; name="field1"
 
@@ -74,6 +76,9 @@ line7
 line8
 
 ------------------------------5dbea401cd8c--
+
+0
+
 </protocol>
 </verify>
 </testcase>