diff --git a/Source/exehead/exec.c b/Source/exehead/exec.c
index c1f59265..459cf354 100644
--- a/Source/exehead/exec.c
+++ b/Source/exehead/exec.c
@@ -1367,7 +1367,6 @@ static int NSISCALL ExecuteEntry(entry *entry_)
       // Jim Park/Wizou: in Unicode version of NSIS, EW_FPUTS still deals with ANSI files (conversion is done). We add EW_FPUTWS to deal with Unicode files.
 #endif
       {
-        DWORD dw;
         int l; // number of bytes to write
         TCHAR *t=var0;
         const int writeCodPt = parm2, ansi = EW_FPUTS == which;
@@ -1395,7 +1394,7 @@ static int NSISCALL ExecuteEntry(entry *entry_)
 #ifdef _UNICODE
           if ((ansi | writeCodPt) || !parm3 || SUCCEEDED(UTF16LEBOM(hFile,(INT_PTR)hFile)))
 #endif
-            if (WriteFile(hFile,buf1,l,&dw,NULL))
+            if (myWriteFile(hFile,buf1,l))
               break; // Success
         }
         exec_error++;
@@ -1549,7 +1548,6 @@ static int NSISCALL ExecuteEntry(entry *entry_)
           filebuf=(unsigned char *)GlobalAlloc(GPTR,filehdrsize);
           if (filebuf)
           {
-            DWORD lout;
             SetSelfFilePointer(0);
             ReadSelfFile((char*)filebuf,filehdrsize);
             {
@@ -1571,7 +1569,7 @@ static int NSISCALL ExecuteEntry(entry *entry_)
                 GlobalFree(unicon_data);
               }
             }
-            WriteFile(hFile,(char*)filebuf,filehdrsize,&lout,NULL);
+            myWriteFile(hFile,(char*)filebuf,filehdrsize);
             GlobalFree(filebuf);
             ret=GetCompressedDataFromDataBlock(-1,hFile);
           }
diff --git a/Source/exehead/fileform.c b/Source/exehead/fileform.c
index d77252b1..2f3b0bc6 100644
--- a/Source/exehead/fileform.c
+++ b/Source/exehead/fileform.c
@@ -430,8 +430,7 @@ int NSISCALL _dodecomp(int offset, HANDLE hFileOut, unsigned char *outbuf, int o
 
         if (!outbuf)
         {
-          DWORD r;
-          if (!WriteFile(hFileOut,outbuffer,u,&r,NULL) || (int)r != u) return -2;
+          if (!myWriteFile(hFileOut,outbuffer,u)) return -2;
           retval+=u;
         }
         else
@@ -452,9 +451,8 @@ int NSISCALL _dodecomp(int offset, HANDLE hFileOut, unsigned char *outbuf, int o
       while (input_len > 0)
       {
         DWORD l=min(input_len,outbuffer_len);
-        DWORD t;
         if (!ReadSelfFile((LPVOID)inbuffer,l)) return -3;
-        if (!WriteFile(hFileOut,inbuffer,l,&t,NULL) || l!=t) return -2;
+        if (!myWriteFile(hFileOut,inbuffer,l)) return -2;
         retval+=l;
         input_len-=l;
       }
@@ -498,7 +496,7 @@ static int NSISCALL __ensuredata(int amount)
       g_inflate_stream.avail_in=l;
       do
       {
-        DWORD r,t;
+        DWORD r;
 #ifdef NSIS_CONFIG_VISIBLE_SUPPORT
         if (g_header)
 #ifdef NSIS_CONFIG_SILENT_SUPPORT
@@ -520,7 +518,7 @@ static int NSISCALL __ensuredata(int amount)
         r=BUGBUG64TRUNCATE(DWORD,(UINT_PTR)g_inflate_stream.next_out)-BUGBUG64TRUNCATE(DWORD,(UINT_PTR)_outbuffer);
         if (r)
         {
-          if (!WriteFile(dbd_hFile,_outbuffer,r,&t,NULL) || r != t)
+          if (!myWriteFile(dbd_hFile,_outbuffer,r))
           {
             return -2;
           }
@@ -568,10 +566,9 @@ int NSISCALL _dodecomp(int offset, HANDLE hFileOut, unsigned char *outbuf, int o
   {
     while (input_len > 0)
     {
-      DWORD t;
       DWORD l=min(input_len,IBUFSIZE);
       if (!myReadFile(dbd_hFile,(LPVOID)_inbuffer,r=l)) return -3;
-      if (!WriteFile(hFileOut,_inbuffer,r,&t,NULL) || t != l) return -2;
+      if (!myWriteFile(hFileOut,_inbuffer,r)) return -2;
       retval+=r;
       input_len-=r;
       dbd_pos+=r;
diff --git a/Source/exehead/util.c b/Source/exehead/util.c
index 0803379d..2e315a70 100644
--- a/Source/exehead/util.c
+++ b/Source/exehead/util.c
@@ -452,14 +452,19 @@ TCHAR * NSISCALL my_GetTempFileName(TCHAR *buf, const TCHAR *dir)
 BOOL NSISCALL myReadFile(HANDLE h, LPVOID buf, DWORD cb)
 {
   DWORD cbio;
-  BOOL r = ReadFile(h, buf, cb, &cbio, NULL);
-  return r && cb == cbio;
+  return ReadFile(h, buf, cb, &cbio, NULL) && cb == cbio;
+}
+
+BOOL NSISCALL myWriteFile(HANDLE h, const void*buf, DWORD cb)
+{
+  DWORD cbio;
+  return WriteFile(h, buf, cb, &cbio, NULL) && cb == cbio;
 }
 
 // Reading skips the BOM if present, writing writes it to a empty file
 HRESULT NSISCALL UTF16LEBOM(HANDLE h, INT_PTR ForWrite)
 {
-  DWORD orgpos = SetFilePointer(h, 0, NULL, FILE_CURRENT), cbio;
+  DWORD orgpos = SetFilePointer(h, 0, NULL, FILE_CURRENT);
   if (0 == orgpos)
   {
     BYTE bom[2];
@@ -472,11 +477,10 @@ HRESULT NSISCALL UTF16LEBOM(HANDLE h, INT_PTR ForWrite)
       if (0 == SetFilePointer(h, 0, NULL, FILE_CURRENT)) // Is the file empty?
       {
         static const BYTE bom16le[] = { 0xff, 0xfe };
-        return (WriteFile(h, bom16le, 2, &cbio, NULL) && 2 == cbio)
-          ? S_OK : E_FAIL;
+        return myWriteFile(h, bom16le, 2) ? S_OK : E_FAIL;
       }
     }
-    SetFilePointer(h, 0, NULL, FILE_BEGIN); // The file may have starting with something that was not a BOM, undo the read
+    SetFilePointer(h, 0, NULL, FILE_BEGIN); // The file may have started with something that was not a BOM, undo the read
   }
   return S_FALSE;
 }
@@ -498,9 +502,7 @@ void RenameViaWininit(const TCHAR* prevName, const TCHAR* newName)
   int cchRenameLine;
   LPCSTR szRenameSec = "[Rename]\r\n"; // rename section marker
   HANDLE hfile;
-  DWORD dwFileSize;
-  DWORD dwBytes;
-  DWORD dwRenameLinePos;
+  DWORD dwFileSize, dwRenameLinePos;
   char *pszWinInit;   // Contains the file contents of wininit.ini
 
   int spn;   // length of the short path name in TCHARs.
@@ -572,7 +574,7 @@ void RenameViaWininit(const TCHAR* prevName, const TCHAR* newName)
         dwFileSize += cchRenameLine;
 
         SetFilePointer(hfile, 0, NULL, FILE_BEGIN);
-        WriteFile(hfile, pszWinInit, dwFileSize, &dwBytes, NULL);
+        myWriteFile(hfile, pszWinInit, dwFileSize);
 
         GlobalFree(pszWinInit);
       }
@@ -952,9 +954,8 @@ void NSISCALL log_write(int close)
     }
     if (fp!=INVALID_HANDLE_VALUE)
     {
-      DWORD d;
       mystrcat(log_text,_T("\r\n"));
-      WriteFile(fp,log_text,mystrlen(log_text)*sizeof(TCHAR),&d,NULL);
+      myWriteFile(fp,log_text,mystrlen(log_text)*sizeof(TCHAR));
     }
   }
 }
@@ -1013,6 +1014,9 @@ void log_timestamp(TCHAR *buf)
 
 void log_printf(TCHAR *format, ...)
 {
+#ifdef NSIS_CONFIG_LOG_STDOUT
+  HANDLE hStdOut;
+#endif
   va_list val;
   va_start(val,format);
 
@@ -1026,11 +1030,10 @@ void log_printf(TCHAR *format, ...)
     OutputDebugString(log_text);
 #endif
 #ifdef NSIS_CONFIG_LOG_STDOUT
-  if (log_dolog && GetStdHandle(STD_OUTPUT_HANDLE) != INVALID_HANDLE_VALUE)
+  if (log_dolog && (hStdOut = GetStdHandle(STD_OUTPUT_HANDLE)) != INVALID_HANDLE_VALUE)
   {
-    DWORD dwBytes;
-    WriteFile(GetStdHandle(STD_OUTPUT_HANDLE), log_text, lstrlen(log_text), &dwBytes, NULL);
-    WriteFile(GetStdHandle(STD_OUTPUT_HANDLE), _T("\n"), 1, &dwBytes, NULL);
+    myWriteFile(hStdOut, log_text, lstrlen(log_text)); // BUGBUG: Should this be lstrlen*sizeof(TCHAR)?
+    myWriteFile(hStdOut, _T("\n"), 1); // BUGBUG: sizeof(TCHAR)?
   }
 #endif
 #if !defined(NSIS_CONFIG_LOG_ODS) && !defined(NSIS_CONFIG_LOG_STDOUT)
diff --git a/Source/exehead/util.h b/Source/exehead/util.h
index 49f49c92..e9533e7d 100644
--- a/Source/exehead/util.h
+++ b/Source/exehead/util.h
@@ -44,6 +44,7 @@ TCHAR * NSISCALL mystrstr(TCHAR *a, TCHAR *b);
 WIN32_FIND_DATA * NSISCALL file_exists(TCHAR *buf);
 TCHAR * NSISCALL my_GetTempFileName(TCHAR *buf, const TCHAR *dir);
 BOOL NSISCALL myReadFile(HANDLE h, LPVOID buf, DWORD cb);
+BOOL NSISCALL myWriteFile(HANDLE h, const void*buf, DWORD cb);
 HRESULT NSISCALL UTF16LEBOM(HANDLE h, INT_PTR ForWrite);
 
 //BOOL NSISCALL my_SetWindowText(HWND hWnd, const TCHAR *val);