diff --git a/src/BizHawk.Client.Common/movie/MovieService.cs b/src/BizHawk.Client.Common/movie/MovieService.cs
index c8cbbe26b0..9e8bb6ec99 100644
--- a/src/BizHawk.Client.Common/movie/MovieService.cs
+++ b/src/BizHawk.Client.Common/movie/MovieService.cs
@@ -1,5 +1,6 @@
 using System;
 using System.Collections.Generic;
+using System.Globalization;
 using System.Linq;
 using BizHawk.Common.NumberExtensions;
 
@@ -46,10 +47,15 @@ namespace BizHawk.Client.Common
 				.Trim()
 				.Replace("v", "");
 
-			var result = double.TryParse(versionStr, out double version);
-			if (result)
+			if (double.TryParse(versionStr, NumberStyles.Float, CultureInfo.InvariantCulture, out var parsedWithPeriod))
 			{
-				return version;
+				return parsedWithPeriod;
+			}
+
+			// Accept .tasproj files written from <= 2.5 where the host culture settings used ','
+			if (double.TryParse(versionStr, NumberStyles.Float, CultureInfo.InvariantCulture, out var parsedWithComma))
+			{
+				return parsedWithComma;
 			}
 
 			return 1.0F;
diff --git a/src/BizHawk.Client.Common/movie/tasproj/TasMovie.cs b/src/BizHawk.Client.Common/movie/tasproj/TasMovie.cs
index 7642d6f08d..1a669b57eb 100644
--- a/src/BizHawk.Client.Common/movie/tasproj/TasMovie.cs
+++ b/src/BizHawk.Client.Common/movie/tasproj/TasMovie.cs
@@ -1,6 +1,7 @@
 using System;
 using System.Collections.Generic;
 using System.ComponentModel;
+using System.Globalization;
 using System.IO;
 using System.Linq;
 using BizHawk.Emulation.Common;
@@ -19,7 +20,7 @@ namespace BizHawk.Client.Common
 		{
 			Branches = new TasBranchCollection(this);
 			ChangeLog = new TasMovieChangeLog(this);
-			Header[HeaderKeys.MovieVersion] = $"BizHawk v2.0 Tasproj v{CurrentVersion}";
+			Header[HeaderKeys.MovieVersion] = $"BizHawk v2.0 Tasproj v{CurrentVersion.ToString(CultureInfo.InvariantCulture)}";
 			Markers = new TasMovieMarkerList(this);
 			Markers.CollectionChanged += Markers_CollectionChanged;
 			Markers.Add(0, "Power on");