diff --git a/ext/lsm1/lsm_win32.c b/ext/lsm1/lsm_win32.c
index 50c5b67af6..af58176609 100644
--- a/ext/lsm1/lsm_win32.c
+++ b/ext/lsm1/lsm_win32.c
@@ -39,7 +39,7 @@ struct Win32File {
   HANDLE hShmFile;                /* File handle for *-shm file */
 
   HANDLE hMap;                    /* File handle for mapping */
-  void *pMap;                     /* Pointer to mapping of file fd */
+  LPVOID pMap;                    /* Pointer to mapping of file fd */
   size_t nMap;                    /* Size of mapping at pMap in bytes */
   int nShm;                       /* Number of entries in array apShm[] */
   void **apShm;                   /* Array of 32K shared memory segments */
@@ -291,10 +291,10 @@ static int lsmWin32OsTruncate(
   lsm_i64 nSize    /* Size to truncate file to */
 ){
   Win32File *pWin32File = (Win32File *)pFile;
-  LARGE_INTEGER largeInteger; /* The new offset */
+  LARGE_INTEGER offset;
 
-  largeInteger.QuadPart = nSize;
-  if( !SetFilePointerEx(pWin32File->hFile, largeInteger, 0, FILE_BEGIN) ){
+  offset.QuadPart = nSize;
+  if( !SetFilePointerEx(pWin32File->hFile, offset, 0, FILE_BEGIN) ){
     return LSM_IOERR_BKPT;
   }
   if (!SetEndOfFile(pWin32File->hFile) ){
@@ -335,7 +335,7 @@ static int lsmWin32OsSync(lsm_file *pFile){
 #ifndef LSM_NO_SYNC
   Win32File *pWin32File = (Win32File *)pFile;
 
-  if( pWin32File->pMap ){
+  if( pWin32File->pMap!=NULL ){
     if( !FlushViewOfFile(pWin32File->pMap, 0) ){
       rc = LSM_IOERR_BKPT;
     }
@@ -359,7 +359,61 @@ static int lsmWin32OsRemap(
   void **ppOut,
   lsm_i64 *pnOut
 ){
-  return LSM_ERROR;
+  Win32File *pWin32File = (Win32File *)pFile;
+
+  /* If the file is between 0 and 2MB in size, extend it in chunks of 256K.
+  ** Thereafter, in chunks of 1MB at a time.  */
+  const int aIncrSz[] = {256*1024, 1024*1024};
+  int nIncrSz = aIncrSz[iMin>(2*1024*1024)];
+
+  if( pWin32File->pMap!=NULL ){
+    UnmapViewOfFile(pWin32File->pMap);
+    *ppOut = pWin32File->pMap = NULL;
+    *pnOut = pWin32File->nMap = 0;
+  }
+  if( pWin32File->hMap!=NULL ){
+    CloseHandle(pWin32File->hMap);
+    pWin32File->hMap = NULL;
+  }
+  if( iMin>=0 ){
+    LARGE_INTEGER fileSize;
+    DWORD dwSizeHigh;
+    DWORD dwSizeLow;
+    HANDLE hMap;
+    LPVOID pMap;
+    memset(&fileSize, 0, sizeof(LARGE_INTEGER));
+    if( !GetFileSizeEx(pWin32File->hFile, &fileSize) ){
+      return LSM_IOERR_BKPT;
+    }
+    assert( fileSize.QuadPart>=0 );
+    if( fileSize.QuadPart<iMin ){
+      int rc;
+      fileSize.QuadPart = ((iMin + nIncrSz-1) / nIncrSz) * nIncrSz;
+      rc = lsmWin32OsTruncate(pFile, fileSize.QuadPart);
+      if( rc!=LSM_OK ){
+        return rc;
+      }
+    }
+    dwSizeLow = (DWORD)(fileSize.QuadPart & 0xFFFFFFFF);
+    dwSizeHigh = (DWORD)((fileSize.QuadPart & 0x7FFFFFFFFFFFFFFF) >> 32);
+    hMap = CreateFileMappingW(pWin32File->hFile, NULL, PAGE_READWRITE,
+                              dwSizeHigh, dwSizeLow, NULL);
+    if( hMap==NULL ){
+      return LSM_IOERR_BKPT;
+    }
+    pWin32File->hMap = hMap;
+    assert( fileSize.QuadPart<=0xFFFFFFFF );
+    pMap = MapViewOfFile(hMap, FILE_MAP_WRITE | FILE_MAP_READ, 0, 0,
+                         (SIZE_T)fileSize.QuadPart);
+    if( pMap==NULL ){
+      return LSM_IOERR_BKPT;
+    }
+    pWin32File->pMap = pMap;
+    pWin32File->nMap = (SIZE_T)fileSize.QuadPart;
+  }
+  *ppOut = pWin32File->pMap;
+  *pnOut = pWin32File->nMap;
+  return LSM_OK;
 }
 
 static BOOL win32IsDriveLetterAndColon(
@@ -532,17 +586,23 @@ static int lsmWin32OsClose(lsm_file *pFile){
   int nRetry = 0;
   Win32File *pWin32File = (Win32File *)pFile;
   lsmWin32OsShmUnmap(pFile, 0);
-  if( pWin32File->pMap ){
+  if( pWin32File->pMap!=NULL ){
     UnmapViewOfFile(pWin32File->pMap);
-    pWin32File->pMap = 0;
+    pWin32File->pMap = NULL;
+    pWin32File->nMap = 0;
   }
   if( pWin32File->hMap!=NULL ){
     CloseHandle(pWin32File->hMap);
     pWin32File->hMap = NULL;
   }
   do{
+    if( pWin32File->hFile==NULL ){
+      rc = LSM_IOERR_BKPT;
+      break;
+    }
     rc = CloseHandle(pWin32File->hFile);
     if( rc ){
+      pWin32File->hFile = NULL;
       rc = LSM_OK;
       break;
     }
diff --git a/manifest b/manifest
index af213f1571..6fee259a7a 100644
--- a/manifest
+++ b/manifest
@@ -1,5 +1,5 @@
-C Implement\sxLock\sand\sxTestLock\sfor\slsm1\son\sWin32.
-D 2017-06-28T21:36:40.949
+C Implement\sxRemap\sfor\slsm1\son\sWin32.\s\sAlso,\szero\sfile\shandle\swhen\sclosing\sit.
+D 2017-06-29T00:20:42.289
 F Makefile.in 1cc758ce3374a32425e4d130c2fe7b026b20de5b8843243de75f087c0a2661fb
 F Makefile.linux-gcc 7bc79876b875010e8c8f9502eb935ca92aa3c434
 F Makefile.msc d389c6fb3344ea6887b386d56784a6d8a5c85107294448aeda50ac404285a1ef
@@ -249,7 +249,7 @@ F ext/lsm1/lsm_tree.c 5d9fb2bc58a1a70c75126bd8d7198f7b627e165b
 F ext/lsm1/lsm_unix.c ee0201dff10ce2008ef13a65f52a6ea348f287e795270f651596f812fcfccdcc
 F ext/lsm1/lsm_varint.c b19ae9bd26b5a1e8402fb8a564b25d9542338a41
 F ext/lsm1/lsm_vtab.c fff303ce03168eca9e333add3c1429b3471674b0
-F ext/lsm1/lsm_win32.c a1a3d712f8112a93899a2964cb09dbedcea28e352d81048632c72cf6a14eb2c9
+F ext/lsm1/lsm_win32.c 4896cd8af7a65dcd2b2dacca81455be896130b23ca19cf4a7e3f6eed5442d812
 F ext/misc/README.md 8e008c8d2b02e09096b31dfba033253ac27c6c06a18aa5826e299fa7601d90b2
 F ext/misc/amatch.c 6db4607cb17c54b853a2d7c7c36046d004853f65b9b733e6f019d543d5dfae87
 F ext/misc/anycollseq.c 5ffdfde9829eeac52219136ad6aa7cd9a4edb3b15f4f2532de52f4a22525eddb
@@ -1624,7 +1624,7 @@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a91a7acc6293828957a386a8a93
 F vsixtest/vsixtest.vcxproj.data 2ed517e100c66dc455b492e1a33350c1b20fbcdc
 F vsixtest/vsixtest.vcxproj.filters 37e51ffedcdb064aad6ff33b6148725226cd608e
 F vsixtest/vsixtest_TemporaryKey.pfx e5b1b036facdb453873e7084e1cae9102ccc67a0
-P d0f6973d93c36451bf64f47de9a88abec613a624603033bf6717f5071139b6d2
-R 21110d45751e806c992b04ef05ac7e74
+P 9112117dad8085c385aa614cd982b307f5822761607ba358f34df7848c549134
+R 887ca9ca211e19ac7f1bf925dfe592df
 U mistachkin
-Z e53e89fbbfaae4a22bd4502cd00f0ba9
+Z 2dc70b160b5c8095c4a09a655916e2c6
diff --git a/manifest.uuid b/manifest.uuid
index 368f6f1ff2..63f7e3d038 100644
--- a/manifest.uuid
+++ b/manifest.uuid
@@ -1 +1 @@
-9112117dad8085c385aa614cd982b307f5822761607ba358f34df7848c549134
\ No newline at end of file
+93c9aa7d9aea46b331c53ff579ef704e88ce90f96600b69479a87a4bb4ca2a91
\ No newline at end of file