diff -urN ../exim-4.95.orig/src/expand.c ./src/expand.c
--- ../exim-4.95.orig/src/expand.c	2022-10-18 22:35:53.844234000 +0300
+++ ./src/expand.c	2022-10-18 21:17:29.541066000 +0300
@@ -633,6 +633,7 @@
   { "mime_content_type",   vtype_stringptr,   &mime_content_type },
   { "mime_decoded_filename", vtype_stringptr, &mime_decoded_filename },
   { "mime_filename",       vtype_stringptr,   &mime_filename },
+  { "mime_filename_raw",   vtype_stringptr,   &mime_filename_raw },
   { "mime_is_coverletter", vtype_int,         &mime_is_coverletter },
   { "mime_is_multipart",   vtype_int,         &mime_is_multipart },
   { "mime_is_rfc822",      vtype_int,         &mime_is_rfc822 },
diff -urN ../exim-4.95.orig/src/globals.c ./src/globals.c
--- ../exim-4.95.orig/src/globals.c	2022-10-18 22:35:54.325045000 +0300
+++ ./src/globals.c	2022-10-18 21:17:25.691928000 +0300
@@ -1196,6 +1196,7 @@
 uschar *mime_content_type      = NULL;
 uschar *mime_decoded_filename  = NULL;
 uschar *mime_filename          = NULL;
+uschar *mime_filename_raw      = NULL;
 int     mime_is_multipart      = 0;
 int     mime_is_coverletter    = 0;
 int     mime_is_rfc822         = 0;
diff -urN ../exim-4.95.orig/src/globals.h ./src/globals.h
--- ../exim-4.95.orig/src/globals.h	2022-10-18 22:35:53.925975000 +0300
+++ ./src/globals.h	2022-10-18 21:17:22.971969000 +0300
@@ -754,6 +754,7 @@
 extern uschar *mime_content_type;
 extern uschar *mime_decoded_filename;
 extern uschar *mime_filename;
+extern uschar *mime_filename_raw;
 extern int     mime_is_multipart;
 extern int     mime_is_coverletter;
 extern int     mime_is_rfc822;
diff -urN ../exim-4.95.orig/src/mime.c ./src/mime.c
--- ../exim-4.95.orig/src/mime.c	2022-10-18 22:50:46.157388000 +0300
+++ ./src/mime.c	2022-10-18 22:46:14.568253000 +0300
@@ -409,6 +409,7 @@
 mime_charset           = NULL;
 mime_decoded_filename  = NULL;
 mime_filename          = NULL;
+mime_filename_raw      = NULL;
 mime_content_description = NULL;
 mime_content_disposition = NULL;
 mime_content_id        = NULL;
@@ -592,11 +593,21 @@
 	      {
 	      uschar * q;
 	      uschar * dummy_errstr;
+	      BOOL param_is_filename = FALSE;
 
+	      if ((strncmpic("name=", p, 5) == 0) || (strncmpic("filename=", p, 9) == 0))
+		param_is_filename = TRUE;
+
 	      /* grab the value and copy to its expansion variable */
 	      p += mp->namelen;
 	      q = mime_param_val(&p);		/* p now trailing ; or NUL */
 
+	      if (param_is_filename)
+		{
+		mime_filename_raw = string_copy(q);
+		DEBUG(D_acl) debug_printf_indent("MIME:    mime_filename_raw: '%s'\n", mime_filename_raw);
+		}
+
 	      *mp->value = q && *q
 		? rfc2047_decode(q, check_rfc2047_length, NULL, 32, NULL,
 		    &dummy_errstr)
@@ -638,6 +649,8 @@
                     p = q; p++;
                   }
                   DEBUG(D_acl) debug_printf_indent("MIME:    fname '%s'\n", mime_filename_rfc2231);
+                  mime_filename_raw = string_copy_malloc(mime_filename_rfc2231);
+                  DEBUG(D_acl) debug_printf_indent("MIME:    mime_filename_raw: '%s'\n", mime_filename_raw);
 
                   if (Ustrlen(mime_filename_rfc2231) > 0) {
                     uschar * mime_filename_rfc2231_decoded;