diff --git a/hdr/network.h b/hdr/network.h
index dcb66f0..7e33e5c 100644
--- a/hdr/network.h
+++ b/hdr/network.h
@@ -59,6 +59,9 @@
 #define REM_PRINTREDIR  0x1125
 #define REM_EXTOC       0x112e
 
+/* Redirector extensions */
+#define REM_GETLARGESPACE    0x11a3
+
 struct rgds {
   UWORD r_spc;
   UWORD r_navc;
diff --git a/kernel/dosfns.c b/kernel/dosfns.c
index f9655f8..3a8451f 100644
--- a/kernel/dosfns.c
+++ b/kernel/dosfns.c
@@ -771,7 +771,7 @@ UWORD DosGetFree(UBYTE drive, UWORD * navc, UWORD * bps, UWORD * nc)
   /* navc==NULL means: called from FatGetDrvData, fcbfns.c */
   struct dpb FAR *dpbp;
   struct cds FAR *cdsp;
-  COUNT rg[4];
+  COUNT rg[5];  /* add space for SI, although it's unused here */
   UWORD spc;
 
   /* first check for valid drive          */
@@ -876,7 +876,7 @@ COUNT DosGetExtFree(BYTE FAR * DriveString, struct xfreespace FAR * xfsp)
 {
   struct dpb FAR *dpbp;
   struct cds FAR *cdsp;
-  UCOUNT rg[4];
+  UCOUNT rg[5];
 
   /* ensure all fields known value - clear reserved bytes & set xfs_version.actual to 0 */
   fmemset(xfsp, 0, sizeof(struct xfreespace));
@@ -899,13 +899,44 @@ COUNT DosGetExtFree(BYTE FAR * DriveString, struct xfreespace FAR * xfsp)
 
   if (cdsp->cdsFlags & CDSNETWDRV)
   {
-    if (remote_getfree(cdsp, rg) != SUCCESS)
-      return DE_INVLDDRV;
+    /* Try redirector extension */
+    if (remote_getfree_11a3(cdsp, rg) != SUCCESS)
+    {
+      /* Fallback */
+      if (remote_getfree(cdsp, rg) != SUCCESS)
+        return DE_INVLDDRV;
 
-    xfsp->xfs_clussize = rg[0];
-    xfsp->xfs_totalclusters = rg[1];
-    xfsp->xfs_secsize = rg[2];
-    xfsp->xfs_freeclusters = rg[3];
+      xfsp->xfs_clussize = rg[0];
+      xfsp->xfs_totalclusters = rg[1];
+      xfsp->xfs_secsize = rg[2];
+      xfsp->xfs_freeclusters = rg[3];
+    }
+    else /* Supports extension */
+    {
+      UDWORD total, avail;
+      UDWORD bps, spc;
+
+      bps = rg[4];
+      spc = 1;
+      total = (((UDWORD)rg[0] << 16UL) | rg[1]);
+      avail = (((UDWORD)rg[2] << 16UL) | rg[3]);
+
+      while (total > 0x00ffffff && spc < 128) {
+        spc *= 2;
+        avail /= 2;
+        total /= 2;
+      }
+      while (total > 0x00ffffff && bps < 32768) {
+        bps *= 2;
+        avail /= 2;
+        total /= 2;
+      }
+
+      xfsp->xfs_secsize = bps;
+      xfsp->xfs_clussize = spc;
+      xfsp->xfs_totalclusters = total;
+      xfsp->xfs_freeclusters = avail;
+    }
   }
   else
   {
diff --git a/kernel/int2f.asm b/kernel/int2f.asm
index 70f1bca..8ab31fc 100644
--- a/kernel/int2f.asm
+++ b/kernel/int2f.asm
@@ -428,6 +428,8 @@ call_int2f:
                 push    cx             ; arg
                 cmp     al, 0ch
                 je      remote_getfree
+                cmp     al, 0xa3
+                je      remote_getfree
                 cmp     al, 1eh
                 je      remote_print_doredir
                 cmp     al, 1fh
@@ -478,6 +480,7 @@ remote_getfree:
                 mov     [di+2],bx
                 mov     [di+4],cx
                 mov     [di+6],dx
+                mov     [di+8],si	; for REM_GETLARGEFREE, unused on REM_GETFREE
                 jmp     short ret_set_ax_to_carry
 
 remote_rw:
diff --git a/kernel/proto.h b/kernel/proto.h
index f8fa240..551d03b 100644
--- a/kernel/proto.h
+++ b/kernel/proto.h
@@ -377,6 +377,7 @@ int network_redirector_fp(unsigned cmd, void far *s);
 long ASMPASCAL network_redirector_mx(unsigned cmd, void far *s, void *arg);
 #define remote_rw(cmd,s,arg) network_redirector_mx(cmd, s, (void *)arg)
 #define remote_getfree(s,d) (int)network_redirector_mx(REM_GETSPACE, s, d)
+#define remote_getfree_11a3(s,d) (int)network_redirector_mx(REM_GETLARGESPACE, s, d)
 #define remote_lseek(s,new_pos) network_redirector_mx(REM_LSEEK, s, &new_pos)
 #define remote_setfattr(attr) (int)network_redirector_mx(REM_SETATTR, NULL, (void *)attr)
 #define remote_printredir(dx,ax) (int)network_redirector_mx(REM_PRINTREDIR, MK_FP(0,dx),(void *)ax)