diff --git a/libisofs/ecma119_tree.c b/libisofs/ecma119_tree.c
index 63c150d..e6f890b 100644
--- a/libisofs/ecma119_tree.c
+++ b/libisofs/ecma119_tree.c
@@ -508,7 +508,7 @@ sort_tree(struct ecma119_tree_node *root)
  * "HELLOTHE03.TXT"
  */
 static void
-mangle_name(char **name, int num_change, int level, int seq_num)
+mangle_name(char **name, int num_change, int level, int relaxed, int seq_num)
 {
 	char *dot = strrchr(*name, '.');
 	char *semi = strrchr(*name, ';');
@@ -521,6 +521,24 @@ mangle_name(char **name, int num_change, int level, int seq_num)
 		return;
 	}
 	strncpy(base, *name, len+1);
+	
+	if (relaxed & ECMA119_RELAXED_FILENAMES) {
+		/* relaxed filenames, don't care about extension */
+		int maxlen = (relaxed & (1<<1)) ? 37 : 31;
+		base[maxlen - num_change] = '\0';
+		baselen = strlen(base);
+		if (relaxed & ECMA119_OMIT_VERSION_NUMBERS) {
+			sprintf(fmt, "%%s%%0%1dd", num_change);
+			*name = realloc(*name, baselen + num_change + 1);
+		} else {
+			sprintf(fmt, "%%s%%0%1dd;1", num_change);
+			*name = realloc(*name, baselen + num_change + 3);
+		}
+			
+		sprintf(*name, fmt, base, seq_num);
+		return;
+	}
+	
 	if (dot) {
 		base[dot - *name] = '\0';
 		strncpy(ext, dot+1, len+1);
@@ -533,14 +551,24 @@ mangle_name(char **name, int num_change, int level, int seq_num)
 	}
 	baselen = strlen(base);
 	extlen = strlen(ext);
-	if (level == 1 && baselen + num_change > 8) {
+	
+	if (relaxed & (1<<1)) {
+		/* 37 char filenames */
+		base[36 - extlen - num_change] = '\0';
+	} else if (level == 1 && baselen + num_change > 8) {
 		base[8 - num_change] = '\0';
 	} else if (level != 1 && baselen + extlen + num_change > 30) {
 		base[30 - extlen - num_change] = '\0';
 	}
 
-	sprintf(fmt, "%%s%%0%1dd.%%s;1", num_change);
-	*name = realloc(*name, baselen + extlen + num_change + 4);
+	if (relaxed & ECMA119_OMIT_VERSION_NUMBERS) {
+		sprintf(fmt, "%%s%%0%1dd.%%s", num_change);
+		*name = realloc(*name, baselen + extlen + num_change + 1);
+	} else {
+		sprintf(fmt, "%%s%%0%1dd.%%s;1", num_change);
+		*name = realloc(*name, baselen + extlen + num_change + 4);
+	}
+	
 	sprintf(*name, fmt, base, seq_num, ext);
 }
 
@@ -575,6 +603,7 @@ mangle_all(struct ecma119_tree_node *dir)
 				mangle_name(&(d.children[i+k]->iso_name),
 						n_change,
 						dir->target->iso_level,
+						dir->target->relaxed_constraints,
 						k);
 				d.children[i+k]->dirent_len =
 					calc_dirent_len(d.children[i+k]);