Index: Riskeer/MacroStabilityInwards/src/Riskeer.MacroStabilityInwards.IO/Exporters/MacroStabilityInwardsCalculationGroupExporter.cs
===================================================================
diff -u -r1742a934260056f525c94f9cfc443346dd2dfb70 -r4ccc3643ea3e07ee0989fca27cb1590fe9e5a20b
--- Riskeer/MacroStabilityInwards/src/Riskeer.MacroStabilityInwards.IO/Exporters/MacroStabilityInwardsCalculationGroupExporter.cs	(.../MacroStabilityInwardsCalculationGroupExporter.cs)	(revision 1742a934260056f525c94f9cfc443346dd2dfb70)
+++ Riskeer/MacroStabilityInwards/src/Riskeer.MacroStabilityInwards.IO/Exporters/MacroStabilityInwardsCalculationGroupExporter.cs	(.../MacroStabilityInwardsCalculationGroupExporter.cs)	(revision 4ccc3643ea3e07ee0989fca27cb1590fe9e5a20b)
@@ -1,5 +1,6 @@
 using System;
 using Core.Common.Base.IO;
+using Core.Common.Util;
 using Riskeer.Common.Data.Calculation;
 
 namespace Riskeer.MacroStabilityInwards.IO.Exporters
@@ -17,18 +18,22 @@
         /// </summary>
         /// <param name="calculationGroup">The calculation group to export.</param>
         /// <param name="folderPath">The folder path to export to.</param>
-        /// <exception cref="ArgumentNullException">Thrown when any parameter is <c>null</c>.</exception>
+        /// <exception cref="ArgumentNullException">Thrown when <paramref name="calculationGroup"/> is <c>null</c>.</exception>
+        /// <exception cref="ArgumentException">Thrown when <paramref name="folderPath"/> is invalid.</exception>
+        /// <remarks>A valid path:<list type="bullet">
+        /// <item>is not empty or <c>null</c>,</item>
+        /// <item>does not consist out of only whitespace characters,</item>
+        /// <item>does not contain an invalid character,</item>
+        /// <item>is not too long.</item>
+        /// </list></remarks>
         public MacroStabilityInwardsCalculationGroupExporter(CalculationGroup calculationGroup, string folderPath)
         {
             if (calculationGroup == null)
             {
                 throw new ArgumentNullException(nameof(calculationGroup));
             }
 
-            if (folderPath == null)
-            {
-                throw new ArgumentNullException(nameof(folderPath));
-            }
+            IOUtils.ValidateFolderPath(folderPath);
 
             this.calculationGroup = calculationGroup;
             this.folderPath = folderPath;
Index: Riskeer/MacroStabilityInwards/test/Riskeer.MacroStabilityInwards.IO.Test/Exporters/MacroStabilityInwardsCalculationGroupExporterTest.cs
===================================================================
diff -u -r5a910b0291a79821e74d771fc294976a690e92ad -r4ccc3643ea3e07ee0989fca27cb1590fe9e5a20b
--- Riskeer/MacroStabilityInwards/test/Riskeer.MacroStabilityInwards.IO.Test/Exporters/MacroStabilityInwardsCalculationGroupExporterTest.cs	(.../MacroStabilityInwardsCalculationGroupExporterTest.cs)	(revision 5a910b0291a79821e74d771fc294976a690e92ad)
+++ Riskeer/MacroStabilityInwards/test/Riskeer.MacroStabilityInwards.IO.Test/Exporters/MacroStabilityInwardsCalculationGroupExporterTest.cs	(.../MacroStabilityInwardsCalculationGroupExporterTest.cs)	(revision 4ccc3643ea3e07ee0989fca27cb1590fe9e5a20b)
@@ -1,5 +1,6 @@
 using System;
 using Core.Common.Base.IO;
+using Core.Common.TestUtil;
 using NUnit.Framework;
 using Riskeer.Common.Data.Calculation;
 using Riskeer.MacroStabilityInwards.IO.Exporters;
@@ -13,7 +14,7 @@
         public void Constructor_ExpectedValues()
         {
             // Call
-            var exporter = new MacroStabilityInwardsCalculationGroupExporter(new CalculationGroup(), string.Empty);
+            var exporter = new MacroStabilityInwardsCalculationGroupExporter(new CalculationGroup(), "ValidFolderPath");
 
             // Assert
             Assert.IsInstanceOf<IFileExporter>(exporter);
@@ -31,21 +32,24 @@
         }
 
         [Test]
-        public void Constructor_FolderPathNull_ThrowsArgumentNullException()
+        [TestCase(null)]
+        [TestCase("")]
+        [TestCase("   ")]
+        [TestCase("C:\\Not:Valid")]
+        public void Constructor_InvalidFolderPath_ThrowsArgumentException(string folderPath)
         {
             // Call
-            void Call() => new MacroStabilityInwardsCalculationGroupExporter(new CalculationGroup(), null);
+            void Call() => new MacroStabilityInwardsCalculationGroupExporter(new CalculationGroup(), folderPath);
 
             // Assert
-            var exception = Assert.Throws<ArgumentNullException>(Call);
-            Assert.AreEqual("folderPath", exception.ParamName);
+            Assert.Throws<ArgumentException>(Call);
         }
 
         [Test]
         public void Export_Always_ReturnsFalse()
         {
             // Setup
-            var exporter = new MacroStabilityInwardsCalculationGroupExporter(new CalculationGroup(), string.Empty);
+            var exporter = new MacroStabilityInwardsCalculationGroupExporter(new CalculationGroup(), "ValidFolderPath");
 
             // Call
             bool exportResult = exporter.Export();