diff --git a/all.sas b/all.sas
index 2080418..9b56154 100644
--- a/all.sas
+++ b/all.sas
@@ -1856,7 +1856,7 @@ Usage:
 
     %if "&sysprocessmode " = "SAS Stored Process Server " %then %do;
       data _null_;
-        putlog 'stpsrvset program error and syscc';
+        putlog 'stpsrvset program err and syscc';
         rc=stpsrvset('program error', 0);
         call symputx("syscc",0,"g");
       run;
@@ -1902,6 +1902,62 @@ Usage:
 %mend mp_abort;
 
 /** @endcond *//**
+  @file
+  @brief Append (concatenate) two or more files.
+  @details Will append one more more `appendrefs` (filerefs) to a `baseref`.
+  Uses a binary mechanism, so will work with any file type.  For that reason -
+  use with care!   And supply your own trailing carriage returns in each file..
+
+  Usage:
+
+        filename tmp1 temp;
+        filename tmp2 temp;
+        filename tmp3 temp;
+        data _null_; file tmp1; put 'base file';
+        data _null_; file tmp2; put 'append1';
+        data _null_; file tmp3; put 'append2';
+        run;
+        %mp_appendfile(baseref=tmp1, appendrefs=tmp2 tmp3)
+
+
+  @param [in] baseref= Fileref of the base file (should exist)
+  @param [in] appendrefs= One or more filerefs to be appended to the base
+    fileref.  Space separated.
+
+  @version 9.2
+  @author Allan Bowe, source: https://github.com/sasjs/core
+
+  <h4> SAS Macros </h4>
+  @li mp_abort.sas
+  @li mp_binarycopy.sas
+
+
+**/
+
+%macro mp_appendfile(
+  baseref=0,
+  appendrefs=0
+)/*/STORE SOURCE*/;
+
+%mp_abort(iftrue= (&baseref=0)
+  ,mac=&sysmacroname
+  ,msg=%str(Baseref NOT specified!)
+)
+%mp_abort(iftrue= (&appendrefs=0)
+  ,mac=&sysmacroname
+  ,msg=%str(Appendrefs NOT specified!)
+)
+
+%local i;
+%do i=1 %to %sysfunc(countw(&appendrefs));
+  %mp_abort(iftrue= (&syscc>0)
+    ,mac=&sysmacroname
+    ,msg=%str(syscc=&syscc)
+  )
+  %mp_binarycopy(inref=%scan(&appendrefs,&i), outref=&baseref, mode=APPEND)
+%end;
+
+%mend mp_appendfile;/**
   @file
   @brief Generic assertion
   @details Useful in the context of writing sasjs tests.  The results of the
diff --git a/base/mp_abort.sas b/base/mp_abort.sas
index 51dbedf..099a7ee 100644
--- a/base/mp_abort.sas
+++ b/base/mp_abort.sas
@@ -208,7 +208,7 @@
 
     %if "&sysprocessmode " = "SAS Stored Process Server " %then %do;
       data _null_;
-        putlog 'stpsrvset program error and syscc';
+        putlog 'stpsrvset program err and syscc';
         rc=stpsrvset('program error', 0);
         call symputx("syscc",0,"g");
       run;
diff --git a/base/mp_appendfile.sas b/base/mp_appendfile.sas
new file mode 100644
index 0000000..77537d2
--- /dev/null
+++ b/base/mp_appendfile.sas
@@ -0,0 +1,57 @@
+/**
+  @file
+  @brief Append (concatenate) two or more files.
+  @details Will append one more more `appendrefs` (filerefs) to a `baseref`.
+  Uses a binary mechanism, so will work with any file type.  For that reason -
+  use with care!   And supply your own trailing carriage returns in each file..
+
+  Usage:
+
+        filename tmp1 temp;
+        filename tmp2 temp;
+        filename tmp3 temp;
+        data _null_; file tmp1; put 'base file';
+        data _null_; file tmp2; put 'append1';
+        data _null_; file tmp3; put 'append2';
+        run;
+        %mp_appendfile(baseref=tmp1, appendrefs=tmp2 tmp3)
+
+
+  @param [in] baseref= Fileref of the base file (should exist)
+  @param [in] appendrefs= One or more filerefs to be appended to the base
+    fileref.  Space separated.
+
+  @version 9.2
+  @author Allan Bowe, source: https://github.com/sasjs/core
+
+  <h4> SAS Macros </h4>
+  @li mp_abort.sas
+  @li mp_binarycopy.sas
+
+
+**/
+
+%macro mp_appendfile(
+  baseref=0,
+  appendrefs=0
+)/*/STORE SOURCE*/;
+
+%mp_abort(iftrue= (&baseref=0)
+  ,mac=&sysmacroname
+  ,msg=%str(Baseref NOT specified!)
+)
+%mp_abort(iftrue= (&appendrefs=0)
+  ,mac=&sysmacroname
+  ,msg=%str(Appendrefs NOT specified!)
+)
+
+%local i;
+%do i=1 %to %sysfunc(countw(&appendrefs));
+  %mp_abort(iftrue= (&syscc>0)
+    ,mac=&sysmacroname
+    ,msg=%str(syscc=&syscc)
+  )
+  %mp_binarycopy(inref=%scan(&appendrefs,&i), outref=&baseref, mode=APPEND)
+%end;
+
+%mend mp_appendfile;
\ No newline at end of file
diff --git a/tests/crossplatform/mp_appendfile.test.sas b/tests/crossplatform/mp_appendfile.test.sas
new file mode 100644
index 0000000..1252d0e
--- /dev/null
+++ b/tests/crossplatform/mp_appendfile.test.sas
@@ -0,0 +1,41 @@
+/**
+  @file
+  @brief Testing mp_appendfile.sas macro
+
+  <h4> SAS Macros </h4>
+  @li mp_appendfile.sas
+  @li mp_assert.sas
+
+**/
+
+
+filename tmp1 temp;
+filename tmp2 temp;
+filename tmp3 temp;
+data _null_; file tmp1; put 'base file';
+data _null_; file tmp2; put 'append1';
+data _null_; file tmp3; put 'append2';
+run;
+%mp_appendfile(baseref=tmp1, appendrefs=tmp2 tmp3)
+data _null_;
+  infile tmp1;
+  input;
+  put _infile_;
+  call symputx(cats('check',_n_),_infile_);
+run;
+%global check1 check2 check3;
+%mp_assert(
+  iftrue=("&check1"="base file"),
+  desc=Line 1 of file tmp1 is correct,
+  outds=work.test_results
+)
+%mp_assert(
+  iftrue=("&check2"="append1"),
+  desc=Line 2 of file tmp1 is correct,
+  outds=work.test_results
+)
+%mp_assert(
+  iftrue=("&check3"="append2"),
+  desc=Line 3 of file tmp1 is correct,
+  outds=work.test_results
+)
\ No newline at end of file