diff --git a/mmixlib/customizevd.vcproj b/mmixlib/customizevd.vcproj
index 00c9dbecc277af39dbee73fa3996fa7b06a298d3..139f289f6d38810b07f7fa8d5fb35abb3e4c48e0 100644
--- a/mmixlib/customizevd.vcproj
+++ b/mmixlib/customizevd.vcproj
@@ -185,10 +185,10 @@
 					>
 					<Tool
 						Name="VCCustomBuildTool"
-						Description="copying libconfig.vd"
-						CommandLine="copy $(InputDir)libconfig.vd  $(InputDir)libconfig.h"
-						AdditionalDependencies="$(InputDir)libconfig.vd"
-						Outputs="$(InputDir)libconfig.h"
+						Description=""
+						CommandLine=""
+						AdditionalDependencies=""
+						Outputs=""
 					/>
 				</FileConfiguration>
 				<FileConfiguration
@@ -196,16 +196,36 @@
 					>
 					<Tool
 						Name="VCCustomBuildTool"
-						Description="copying libconfig.vd"
-						CommandLine="copy $(InputDir)libconfig.vd  $(InputDir)libconfig.h"
-						AdditionalDependencies="$(InputDir)libconfig.vd"
-						Outputs="$(InputDir)libconfig.h"
+						Description=""
+						CommandLine=""
+						AdditionalDependencies=""
+						Outputs=""
 					/>
 				</FileConfiguration>
 			</File>
 			<File
 				RelativePath="..\mmixlib\libconfig.vd"
 				>
+				<FileConfiguration
+					Name="Debug|Win32"
+					>
+					<Tool
+						Name="VCCustomBuildTool"
+						Description="copy libconfig.vd  to libconfig.h"
+						CommandLine="copy $(InputDir)libconfig.vd  $(InputDir)libconfig.h"
+						Outputs="$(InputDir)libconfig.h"
+					/>
+				</FileConfiguration>
+				<FileConfiguration
+					Name="Release|Win32"
+					>
+					<Tool
+						Name="VCCustomBuildTool"
+						Description="copy libconfig.vd  to libconfig.h"
+						CommandLine="copy $(InputDir)libconfig.vd  $(InputDir)libconfig.h"
+						Outputs="$(InputDir)libconfig.h"
+					/>
+				</FileConfiguration>
 			</File>
 			<File
 				RelativePath="..\mmixlib\libimport.h"
@@ -236,6 +256,26 @@
 			<File
 				RelativePath="..\mmixlib\libimport.vd"
 				>
+				<FileConfiguration
+					Name="Debug|Win32"
+					>
+					<Tool
+						Name="VCCustomBuildTool"
+						Description="copy libimport.vd  to libimport.h"
+						CommandLine="copy $(InputDir)libimport.vd  $(InputDir)libimport.h"
+						Outputs="$(InputDir)libimport.h"
+					/>
+				</FileConfiguration>
+				<FileConfiguration
+					Name="Release|Win32"
+					>
+					<Tool
+						Name="VCCustomBuildTool"
+						Description="copy libimport.vd  to libimport.h"
+						CommandLine="copy $(InputDir)libimport.vd  $(InputDir)libimport.h"
+						Outputs="$(InputDir)libimport.h"
+					/>
+				</FileConfiguration>
 			</File>
 		</Filter>
 		<Filter
diff --git a/mmixlib/libconfig.ide b/mmixlib/libconfig.ide
index e3cbcb9fdbc93341fe1253ec5d2e4c2519cffdf8..3bb1e5553feec657b4dc173b8c3cb08126cde187 100644
--- a/mmixlib/libconfig.ide
+++ b/mmixlib/libconfig.ide
@@ -110,4 +110,8 @@ extern int mmix_fputc(int c, FILE *f);
 /* define this to record file line and location associations while assembling */
 #define MMIXAL_LINE_LOC(file_no,line_no,cur_loc) add_line_loc(file_no,line_no,cur_loc)
 
+/* define this to record file line and location associations while loading mmo files
+   undefine to get the default behaviour of recording this info in the mem_tetra */
+#define MMIX_LOAD_LINE_LOC(file_no,line_no,cur_loc) add_line_loc(file_no,line_no,cur_loc)
+
 #endif
diff --git a/mmixlib/libconfig.vd b/mmixlib/libconfig.vd
index f6f9645cb15e90de3892de2cca8cd6f3ef40369c..b7ec9187ac415b3130c8d36d9c9c1310fb35aaea 100644
--- a/mmixlib/libconfig.vd
+++ b/mmixlib/libconfig.vd
@@ -2,6 +2,7 @@
 #define LIBCONFIG_H
 
 /* This is the libconfig.h file for MMIX VD  rename to libconfig.h */
+
 #ifdef WIN32
 #pragma warning(disable : 4996)
 #endif
@@ -93,5 +94,8 @@ extern int mmix_fputc(int c, FILE *f);
 /* define this to record file line and location associations while assembling */
 #define MMIXAL_LINE_LOC(file_no,line_no,cur_loc) add_line_loc(file_no,line_no,cur_loc)
 
+/* define this to record file line and location associations while loading mmo files */
+#define MMIX_LOAD_LINE_LOC(file_no,line_no,cur_loc) add_line_loc(file_no,line_no,cur_loc)
+
 #endif
 
diff --git a/mmixlib/libimport.vd b/mmixlib/libimport.vd
index 22559165a64576bff9ab8bc149b0303fda199f96..8262251d81608a325e45051036699c57a141e13a 100644
--- a/mmixlib/libimport.vd
+++ b/mmixlib/libimport.vd
@@ -1,3 +1,8 @@
+/* This is the libimport.h file for MMIX VD  rename to libimport.h */
+
 extern void win32_log(char *msg);
 extern void win32_ferror(int line, char *format, char *str);
-extern void win32_message(char *msg);
\ No newline at end of file
+extern void win32_message(char *msg);
+
+extern void add_line_loc(int file_no, int line_no, octa loc);
+/* report the association of a file/line with a location */
diff --git a/mmixlib/mmixallib.ch b/mmixlib/mmixallib.ch
index 035199352f9f9c3e3c943119bc514f7bf481d0c5..ade2a62f885e21cd46936ccaf54cfaabbc8fb489 100644
--- a/mmixlib/mmixallib.ch
+++ b/mmixlib/mmixallib.ch
@@ -227,7 +227,7 @@ the association of lines and locations.
  for (j=0;j<k;j++) {
 @z
 
-We allocate tree nodes node by node so that we can free them again.
+We allocate tree nodes, node by node, so that we can free them again.
 
 @x
   register trie_node *t=next_trie_node;
diff --git a/mmixlib/mmixlib.ch b/mmixlib/mmixlib.ch
index 8eb0eb85747de6ca1fdb3baf49460d51b8dc18c7..076085869834db0b9540c37a23ab430b2675dc95 100644
--- a/mmixlib/mmixlib.ch
+++ b/mmixlib/mmixlib.ch
@@ -265,12 +265,17 @@ static mem_tetra *load_mem_tetra(octa loc, tetra val)
 @z
 
 Before we increment the line number,
-we reset the frequency.
+we reset the frequency and possibly record file, line, and loc.
 
 @x
+    ll->file_no=cur_file;
+    ll->line_no=cur_line;
     cur_line++;
 @y
+    ll->file_no=cur_file;
+    ll->line_no=cur_line;
     ll->freq=0;
+    MMIX_LOAD_LINE_LOC(cur_file,cur_line,cur_loc);
     cur_line++;
 @z
 
@@ -1345,7 +1350,7 @@ case SWYM:
  else
    strcpy(rhs,"");
 break;
-translation_bypassed_inst: strcpy(lhs,"!absolute address");
+translation_bypassed_inst: strcpy(lhs,"!negative address in load/store");
 g[rQ].h |= N_BIT; new_Q.h |= N_BIT; /* set the n bit */
  goto break_inst;
 privileged_inst: strcpy(lhs,"!kernel only");
diff --git a/mmixlib/mmixlib.h b/mmixlib/mmixlib.h
index 48453462f76a50603b2403c1a7929027799be794..659cd4652a8f3679eed7eb3847b45676f98f8889 100644
--- a/mmixlib/mmixlib.h
+++ b/mmixlib/mmixlib.h
@@ -256,8 +256,6 @@ extern void report_error(char *message, int file_no, int line_no);
 /* report an error in the given file and line. 
  */
 
-extern void add_line_loc(int file_no, int line_no, octa loc);
-/* report the association of a file/line with a location */
 
 extern int mmoimg_main(int argc, char *argv[]);