diff --git a/Source/Images/Build.cmd b/Source/Images/Build.cmd
index 53f5b408..78efeccd 100644
--- a/Source/Images/Build.cmd
+++ b/Source/Images/Build.cmd
@@ -39,8 +39,8 @@ call BuildDisk.cmd ws4 wbw_hd1024
 
 if exist ..\BPBIOS\bpbio-ww.rel call BuildDisk.cmd bp wbw_hd1024
 
-copy hd1024_prefix.bin ..\..\Binary\
+copy hd1024_prefix.dat ..\..\Binary\
 
 echo.
 echo Building Combo Disk (1024 directory entry format) Image...
-copy /b hd1024_prefix.bin + ..\..\Binary\hd1024_cpm22.img + ..\..\Binary\hd1024_zsdos.img + ..\..\Binary\hd1024_nzcom.img + ..\..\Binary\hd1024_cpm3.img + ..\..\Binary\hd1024_zpm3.img + ..\..\Binary\hd1024_ws4.img ..\..\Binary\hd1024_combo.img
+copy /b hd1024_prefix.dat + ..\..\Binary\hd1024_cpm22.img + ..\..\Binary\hd1024_zsdos.img + ..\..\Binary\hd1024_nzcom.img + ..\..\Binary\hd1024_cpm3.img + ..\..\Binary\hd1024_zpm3.img + ..\..\Binary\hd1024_ws4.img ..\..\Binary\hd1024_combo.img
diff --git a/Source/Images/Makefile b/Source/Images/Makefile
index 8374f00f..7df9706f 100644
--- a/Source/Images/Makefile
+++ b/Source/Images/Makefile
@@ -13,7 +13,7 @@ HD1024IMGS = hd1024_cpm22.img hd1024_zsdos.img hd1024_nzcom.img \
 # HD1024IMGS += hd1024_bp.img
 
 HD512PREFIX =
-HD1024PREFIX = hd1024_prefix.bin
+HD1024PREFIX = hd1024_prefix.dat
 
 OBJECTS = $(FDIMGS)
 OBJECTS += $(HD512IMGS) hd512_combo.img $(HD512PREFIX)
@@ -65,10 +65,6 @@ blankhd1024:
 	@LC_ALL=en_US.US-ASCII tr '\000' '\345' </dev/zero | dd of=$@ bs=1024 count=$(HD1024SIZE)
 	@hexdump $@
 
-$(HD512PREFIX):
-
-$(HD1024PREFIX):
-	
 %.img: $(SYSTEMS) blank144 blankhd512 blankhd1024 Makefile
 	@sys= ; \
 	case $@ in \
diff --git a/Source/Images/ReadMe.txt b/Source/Images/ReadMe.txt
index daed71a2..73053a25 100644
--- a/Source/Images/ReadMe.txt
+++ b/Source/Images/ReadMe.txt
@@ -76,7 +76,7 @@ in your RomWBW computer.  On Windows, you can use Win32DiskImager to
 do this (see Tools\Win32DiskImager).  On Linux/Mac, you can usee dd.
 
 WARNING: The hd1024 disk images must be prefixed by the 
-hd1024_prefix.bin file before being written to your target media.  
+hd1024_prefix.dat file before being written to your target media.  
 See the section below called Hard Disk Formats.
 
 Building the Images
@@ -182,19 +182,19 @@ all slices and will assume the slices are located in the defined
 partition.
 
 WARNNG: The hd1024_xxx.img files **must** be prefixed by a partition 
-table before being written to your disk media.  The hd1024_prefix.bin 
+table before being written to your disk media.  The hd1024_prefix.dat 
 file is provided for this.  For example, to make the hd1024_cpm22.img 
 file ready to write to your media, you would need to do something 
 like this:
 
-  | C:\RomWBW\Binary>copy /b hd1024_prefix.bin + hd1024_cpm22.img hd_cpm22.img
+  | C:\RomWBW\Binary>copy /b hd1024_prefix.dat + hd1024_cpm22.img hd_cpm22.img
   
 and then use the resulting hd_cpm22.img to write to the target media.
 
 Since the hd1024 format requires a partition table, you must prefix 
 the slices with a partition table.  You can simply include the file 
-hd1024_prefix.bin before the slice images to accomplish this.  The 
-hd1024_prefix.bin defines the required partition table.  Any number 
+hd1024_prefix.dat before the slice images to accomplish this.  The 
+hd1024_prefix.dat defines the required partition table.  Any number 
 of hd1024 slice images can be concatenated after the prefix.
 
 For example, if you wanted to create a 2 slice disk image using the 
@@ -202,7 +202,7 @@ hd1024 entry format that has ZSDOS in the first slice and Wordstar in
 the second slice, you could use the following command from a Windows 
 command prompt:
  
-  | C:\RomWBW\Binary>copy /b hd1024_prefix.bin + hd1024_zsdos.img + hd1024_ws4.img hd_multi.img
+  | C:\RomWBW\Binary>copy /b hd1024_prefix.dat + hd1024_zsdos.img + hd1024_ws4.img hd_multi.img
 
 In general, the hd1024 format is considered the better format to use. 
 It provides doubles the directory space and places all slices inside 
@@ -498,7 +498,7 @@ Moving image hd1024_ws4.img into output directory...
         1 file(s) copied.
 
 Building Combo Disk (1024 directory entry format) Image...
-hd1024_prefix.bin
+hd1024_prefix.dat
 ..\..\Binary\hd1024_cpm22.img
 ..\..\Binary\hd1024_zsdos.img
 ..\..\Binary\hd1024_nzcom.img
diff --git a/Source/Images/hd1024_prefix.dat b/Source/Images/hd1024_prefix.dat
new file mode 100644
index 00000000..5ddb7549
Binary files /dev/null and b/Source/Images/hd1024_prefix.dat differ