diff --git a/bin/preplots.py b/bin/preplots.py
index 1dae5e4..8f2de1a 100644
--- a/bin/preplots.py
+++ b/bin/preplots.py
@@ -1,9 +1,19 @@
 import fwr
+import delimited
 
 """
 Preplot importing functions.
 """
 
+
+def is_fixed_width (file):
+	fixed_width_types = [ "sps1", "sps21", "p190", "fixed-width" ]
+	return type(file) == dict and "type" in file and file["type"] in fixed_width_types
+
+def is_delimited (file):
+	delimited_types = [ "csv", "p111", "x-sl+csv" ]
+	return type(file) == dict and "type" in file and file["type"] in delimited_types
+
 def from_file (file, realpath = None):
 	"""
 	Return a list of dicts, where each dict has the structure:
@@ -23,12 +33,20 @@ def from_file (file, realpath = None):
 	"""
 
 	filepath = realpath or file["path"]
-	records = fwr.from_file(filepath, file)
+	if is_fixed_width(file):
+		records = fwr.from_file(filepath, file)
+	elif is_delimited(file):
+		records = delimited.from_file(filepath, file)
+	else:
+		return "Unrecognised file format"
 
 	if type(records) == str:
 		# This is an error message
 		return records
 
+	if file.get("type") == "x-sl+csv":
+		return records
+
 	lines = []
 	line_names = set([r["line_name"] for r in records])
 	for line_name in line_names: