diff --git a/src/SIL.Machine/Corpora/ZipParatextProjecTextUpdater.cs b/src/SIL.Machine/Corpora/ZipParatextProjecTextUpdater.cs
new file mode 100644
index 00000000..c8bc8f5d
--- /dev/null
+++ b/src/SIL.Machine/Corpora/ZipParatextProjecTextUpdater.cs
@@ -0,0 +1,29 @@
+using System.IO;
+using System.IO.Compression;
+
+namespace SIL.Machine.Corpora
+{
+    public class ZipParatextProjectTextUpdater : ZipParatextProjectTextUpdaterBase
+    {
+        private readonly ZipArchive _archive;
+
+        public ZipParatextProjectTextUpdater(ZipArchive archive)
+            : base(new ZipParatextProjectSettingsParser(archive))
+        {
+            _archive = archive;
+        }
+
+        protected override bool Exists(string fileName)
+        {
+            return _archive.GetEntry(fileName) != null;
+        }
+
+        protected override Stream Open(string fileName)
+        {
+            ZipArchiveEntry entry = _archive.GetEntry(fileName);
+            if (entry == null)
+                return null;
+            return entry.Open();
+        }
+    }
+}
diff --git a/src/SIL.Machine/Corpora/ZipParatextProjectTextUpdaterBase.cs b/src/SIL.Machine/Corpora/ZipParatextProjectTextUpdaterBase.cs
new file mode 100644
index 00000000..02993a57
--- /dev/null
+++ b/src/SIL.Machine/Corpora/ZipParatextProjectTextUpdaterBase.cs
@@ -0,0 +1,8 @@
+namespace SIL.Machine.Corpora
+{
+    public abstract class ZipParatextProjectTextUpdaterBase : ParatextProjectTextUpdaterBase
+    {
+        protected ZipParatextProjectTextUpdaterBase(ParatextProjectSettingsParserBase settingsParser)
+            : base(settingsParser) { }
+    }
+}
diff --git a/tests/SIL.Machine.Tests/Corpora/UpdateUsfmParserHandlerTests.cs b/tests/SIL.Machine.Tests/Corpora/UpdateUsfmParserHandlerTests.cs
index ad6ce166..51cde197 100644
--- a/tests/SIL.Machine.Tests/Corpora/UpdateUsfmParserHandlerTests.cs
+++ b/tests/SIL.Machine.Tests/Corpora/UpdateUsfmParserHandlerTests.cs
@@ -21,7 +21,7 @@ public void GetUsfm_Verse_CharStyle()
     [Test]
     public void GetUsfm_IdText()
     {
-        string target = UpdateUsfm(idText: "- Updated");
+        string target = UpdateUsfm(idText: "Updated");
         Assert.That(target, Contains.Substring("\\id MAT - Updated\r\n"));
     }
 
@@ -443,21 +443,27 @@ private static string UpdateUsfm(
     )
     {
         if (source is null)
-            source = ReadUsfm();
+        {
+            var updater = new FileParatextProjectTextUpdater(CorporaTestHelpers.UsfmTestProjectPath);
+            return updater.UpdateUsfm(
+                "MAT",
+                rows,
+                fullName: idText,
+                stripAllText: stripAllText,
+                preferExistingText: preferExistingText
+            );
+        }
         else
+        {
             source = source.Trim().ReplaceLineEndings("\r\n") + "\r\n";
-        var updater = new UpdateUsfmParserHandler(
-            rows,
-            idText,
-            stripAllText: stripAllText,
-            preferExistingText: preferExistingText
-        );
-        UsfmParser.Parse(source, updater);
-        return updater.GetUsfm();
-    }
-
-    private static string ReadUsfm()
-    {
-        return File.ReadAllText(Path.Combine(CorporaTestHelpers.UsfmTestProjectPath, "41MATTes.SFM"));
+            var updater = new UpdateUsfmParserHandler(
+                rows,
+                idText,
+                stripAllText: stripAllText,
+                preferExistingText: preferExistingText
+            );
+            UsfmParser.Parse(source, updater);
+            return updater.GetUsfm();
+        }
     }
 }