Index: Riskeer/Integration/src/Riskeer.Integration.IO/Helpers/HydraulicBoundaryLocationCalculationsExportHelper.cs
===================================================================
diff -u -r272cfc214b19eee23c9d875bc000a2b7a9a1a78e -rf15bd0f2220e15da0f793ffd112ec10edb66508f
--- Riskeer/Integration/src/Riskeer.Integration.IO/Helpers/HydraulicBoundaryLocationCalculationsExportHelper.cs	(.../HydraulicBoundaryLocationCalculationsExportHelper.cs)	(revision 272cfc214b19eee23c9d875bc000a2b7a9a1a78e)
+++ Riskeer/Integration/src/Riskeer.Integration.IO/Helpers/HydraulicBoundaryLocationCalculationsExportHelper.cs	(.../HydraulicBoundaryLocationCalculationsExportHelper.cs)	(revision f15bd0f2220e15da0f793ffd112ec10edb66508f)
@@ -22,6 +22,7 @@
 using System;
 using System.Collections.Generic;
 using System.ComponentModel;
+using System.Globalization;
 using System.IO;
 using System.Linq;
 using Core.Common.Util;
@@ -86,9 +87,10 @@
                                     ? Resources.WaterLevels_DisplayName
                                     : Resources.WaveHeights_DisplayName;
 
-            string uniqueName = NamingHelper.GetUniqueName(
-                exportedCalculationFileNames, $"{exportType}_{ReturnPeriodFormattingHelper.FormatFromProbability(targetProbability)}",
-                c => c);
+            string returnPeriod = ReturnPeriodFormattingHelper.FormatFromProbability(targetProbability)
+                                                              .ToString(CultureInfo.InvariantCulture)
+                                                              .Replace(".", "");
+            string uniqueName = NamingHelper.GetUniqueName(exportedCalculationFileNames, $"{exportType}_{returnPeriod}", c => c);
             exportedCalculationFileNames.Add(uniqueName);
 
             string tempFilePath = Path.Combine(folderPath, $"{uniqueName}.{RiskeerCommonIOResources.Shape_file_filter_Extension}");
Index: Riskeer/Integration/test/Riskeer.Integration.IO.Test/Exporters/HydraulicBoundaryLocationCalculationsExporterTest.cs
===================================================================
diff -u -rf9aee5d4feb96880cc68b34823f34c78ed0d2252 -rf15bd0f2220e15da0f793ffd112ec10edb66508f
--- Riskeer/Integration/test/Riskeer.Integration.IO.Test/Exporters/HydraulicBoundaryLocationCalculationsExporterTest.cs	(.../HydraulicBoundaryLocationCalculationsExporterTest.cs)	(revision f9aee5d4feb96880cc68b34823f34c78ed0d2252)
+++ Riskeer/Integration/test/Riskeer.Integration.IO.Test/Exporters/HydraulicBoundaryLocationCalculationsExporterTest.cs	(.../HydraulicBoundaryLocationCalculationsExporterTest.cs)	(revision f15bd0f2220e15da0f793ffd112ec10edb66508f)
@@ -142,7 +142,7 @@
                     void Call() => isExported = exporter.Export();
 
                     // Assert
-                    string expectedFilePath = Path.Combine(directoryPath, "~temp", "Waterstanden bij norm", "Waterstanden_30.000.shp");
+                    string expectedFilePath = Path.Combine(directoryPath, "~temp", "Waterstanden bij norm", "Waterstanden_30000.shp");
                     string expectedMessage = $"Er is een onverwachte fout opgetreden tijdens het schrijven van het bestand '{expectedFilePath}'. " +
                                              "Er zijn geen hydraulische belastingenlocaties geëxporteerd.";
                     TestHelper.AssertLogMessageIsGenerated(Call, expectedMessage);
@@ -164,12 +164,12 @@
             });
             yield return new TestCaseData(assessmentSectionWithTargetProbabilities,new[]
             {
-                "Waterstanden bij norm/Waterstanden_30.000.shp",
-                "Waterstanden bij norm/Waterstanden_30.000 (1).shp",
-                "Waterstanden bij doelkans/Waterstanden_10.000.shp",
-                "Waterstanden bij doelkans/Waterstanden_100.000.shp",
-                "Golfhoogten bij doelkans/Golfhoogten_4.000.shp",
-                "Golfhoogten bij doelkans/Golfhoogten_40.000.shp"
+                "Waterstanden bij norm/Waterstanden_30000.shp",
+                "Waterstanden bij norm/Waterstanden_30000 (1).shp",
+                "Waterstanden bij doelkans/Waterstanden_10000.shp",
+                "Waterstanden bij doelkans/Waterstanden_100000.shp",
+                "Golfhoogten bij doelkans/Golfhoogten_4000.shp",
+                "Golfhoogten bij doelkans/Golfhoogten_40000.shp"
             }).SetName("With UserDefinedTargetProbabilities");
             
             var assessmentSectionWithoutTargetProbabilities = new AssessmentSectionStub();
@@ -181,8 +181,8 @@
             assessmentSectionWithoutTargetProbabilities.WaveHeightCalculationsForUserDefinedTargetProbabilities.Clear();
             yield return new TestCaseData(assessmentSectionWithoutTargetProbabilities, new[]
             {
-                "Waterstanden bij norm/Waterstanden_30.000.shp",
-                "Waterstanden bij norm/Waterstanden_30.000 (1).shp"
+                "Waterstanden bij norm/Waterstanden_30000.shp",
+                "Waterstanden bij norm/Waterstanden_30000 (1).shp"
             }).SetName("Without UserDefinedTargetProbabilities");
         }
     }
Index: Riskeer/Integration/test/Riskeer.Integration.IO.Test/Helpers/HydraulicBoundaryLocationCalculationsExportHelperTest.cs
===================================================================
diff -u -rea0b3fd3a34414e19e5a775a84179e54a60c7058 -rf15bd0f2220e15da0f793ffd112ec10edb66508f
--- Riskeer/Integration/test/Riskeer.Integration.IO.Test/Helpers/HydraulicBoundaryLocationCalculationsExportHelperTest.cs	(.../HydraulicBoundaryLocationCalculationsExportHelperTest.cs)	(revision ea0b3fd3a34414e19e5a775a84179e54a60c7058)
+++ Riskeer/Integration/test/Riskeer.Integration.IO.Test/Helpers/HydraulicBoundaryLocationCalculationsExportHelperTest.cs	(.../HydraulicBoundaryLocationCalculationsExportHelperTest.cs)	(revision f15bd0f2220e15da0f793ffd112ec10edb66508f)
@@ -22,6 +22,7 @@
 using System;
 using System.Collections.Generic;
 using System.ComponentModel;
+using System.Globalization;
 using System.IO;
 using System.Linq;
 using System.Security.AccessControl;
@@ -130,7 +131,7 @@
         public void ExportLocationCalculationsForTargetProbabilities_DuplicateTargetProbability_ReturnsTrueAndWritesExpectedFiles(HydraulicBoundaryLocationCalculationsType calculationsType)
         {
             // Setup
-            const double targetProbability = 0.05;
+            const double targetProbability = 0.00005;
 
             string directoryPath = TestHelper.GetScratchPadPath(nameof(ExportLocationCalculationsForTargetProbabilities_DuplicateTargetProbability_ReturnsTrueAndWritesExpectedFiles));
             Directory.CreateDirectory(directoryPath);
@@ -213,7 +214,10 @@
                                     ? "Waterstanden"
                                     : "Golfhoogten";
 
-            return $"{exportType}_{ReturnPeriodFormattingHelper.FormatFromProbability(targetProbability)}";
+            string returnPeriod = ReturnPeriodFormattingHelper.FormatFromProbability(targetProbability)
+                                                              .ToString(CultureInfo.CurrentCulture)
+                                                              .Replace(".", "");
+            return $"{exportType}_{returnPeriod}";
         }
     }
 }
\ No newline at end of file