diff --git a/de4dot.code/AssemblyModule.cs b/de4dot.code/AssemblyModule.cs
index e0f0b455..3baafd55 100644
--- a/de4dot.code/AssemblyModule.cs
+++ b/de4dot.code/AssemblyModule.cs
@@ -52,7 +52,7 @@ namespace de4dot {
 		}
 
 		void readMethodsFile() {
-			if (new FileInfo(methodsFilename).Exists) {
+			if (Utils.fileExists(methodsFilename)) {
 				using (var reader = new BinaryReader(File.Open(methodsFilename, FileMode.Open, FileAccess.Read, FileShare.Read))) {
 					dumpedMethods = new DumpedMethodsReader(reader).read();
 				}
diff --git a/de4dot.code/AssemblyResolver.cs b/de4dot.code/AssemblyResolver.cs
index 64b763fd..25926172 100644
--- a/de4dot.code/AssemblyResolver.cs
+++ b/de4dot.code/AssemblyResolver.cs
@@ -72,22 +72,13 @@ namespace de4dot {
 		static void addIfExists(string basePath, string extraPath) {
 			try {
 				var path = Path.Combine(basePath, extraPath);
-				if (pathExists(path))
+				if (Utils.pathExists(path))
 					Instance.addSearchDirectory(path);
 			}
 			catch (Exception) {
 			}
 		}
 
-		static bool pathExists(string path) {
-			try {
-				return new DirectoryInfo(path).Exists;
-			}
-			catch (Exception) {
-				return false;
-			}
-		}
-
 		public void addSearchDirectory(string dir) {
 			if (!addedDirectories.ContainsKey(dir)) {
 				addedDirectories[dir] = true;
diff --git a/de4dot.code/CommandLineParser.cs b/de4dot.code/CommandLineParser.cs
index 882fa418..1ab149b3 100644
--- a/de4dot.code/CommandLineParser.cs
+++ b/de4dot.code/CommandLineParser.cs
@@ -95,7 +95,7 @@ namespace de4dot {
 			miscOptions.Add(new OneArgOption("r", null, "Scan for .NET files in all subdirs", "dir", (val) => {
 				addSearchDir();
 				searchDir = new FilesDeobfuscator.SearchDir();
-				if (!new DirectoryInfo(val).Exists)
+				if (!Utils.pathExists(val))
 					exitError(string.Format("Directory {0} does not exist", val));
 				searchDir.InputDirectory = val;
 			}));
@@ -152,7 +152,7 @@ namespace de4dot {
 
 			defaultOption = new OneArgOption("f", null, "Name of .NET file", "file", (val) => {
 				addFile();
-				if (!new FileInfo(val).Exists)
+				if (!Utils.fileExists(val))
 					exitError(string.Format("File \"{0}\" does not exist.", val));
 				newFileOptions = new ObfuscatedFile.Options {
 					Filename = val,
@@ -168,7 +168,7 @@ namespace de4dot {
 			fileOptions.Add(new OneArgOption("m", null, "Name of .methods file", "file", (val) => {
 				if (newFileOptions == null)
 					exitError("Missing input file");
-				if (!new FileInfo(val).Exists)
+				if (!Utils.fileExists(val))
 					exitError(string.Format("File \"{0}\" does not exist.", val));
 				newFileOptions.MethodsFilename = val;
 			}));
diff --git a/de4dot.code/FilesDeobfuscator.cs b/de4dot.code/FilesDeobfuscator.cs
index 7f67135d..e97419a4 100644
--- a/de4dot.code/FilesDeobfuscator.cs
+++ b/de4dot.code/FilesDeobfuscator.cs
@@ -300,9 +300,15 @@ namespace de4dot {
 			void createDirectories(string path) {
 				if (string.IsNullOrEmpty(path))
 					return;
-				var di = new DirectoryInfo(path);
-				if (!di.Exists)
-					di.Create();
+				try {
+					var di = new DirectoryInfo(path);
+					if (!di.Exists)
+						di.Create();
+				}
+				catch (System.Security.SecurityException) {
+				}
+				catch (ArgumentException) {
+				}
 			}
 		}
 
diff --git a/de4dot.code/Utils.cs b/de4dot.code/Utils.cs
index ed1f492e..0c974db6 100644
--- a/de4dot.code/Utils.cs
+++ b/de4dot.code/Utils.cs
@@ -198,5 +198,23 @@ namespace de4dot {
 				return name;
 			return name.Substring(0, i);
 		}
+
+		public static bool pathExists(string path) {
+			try {
+				return new DirectoryInfo(path).Exists;
+			}
+			catch (Exception) {
+				return false;
+			}
+		}
+
+		public static bool fileExists(string path) {
+			try {
+				return new FileInfo(path).Exists;
+			}
+			catch (Exception) {
+				return false;
+			}
+		}
 	}
 }