diff --git a/src/main/java/dan200/computercraft/core/filesystem/ComboMount.java b/src/main/java/dan200/computercraft/core/filesystem/ComboMount.java
index 287ea53a6..b528b6a2d 100644
--- a/src/main/java/dan200/computercraft/core/filesystem/ComboMount.java
+++ b/src/main/java/dan200/computercraft/core/filesystem/ComboMount.java
@@ -94,7 +94,7 @@ else if( foundDirs > 1 )
         }
         else
         {
-            throw new IOException( "Not a directory" );
+            throw new IOException( "Not a directory (" + path + ")" );
         }
     }
     
@@ -109,7 +109,7 @@ public long getSize( @Nonnull String path ) throws IOException
                 return part.getSize( path );
             }
         }
-        throw new IOException( "No such file" );
+        throw new IOException( "No such file (" + path + ")" );
     }
 
     @Nonnull
@@ -124,6 +124,6 @@ public InputStream openForRead( @Nonnull String path ) throws IOException
                 return part.openForRead( path );
             }
         }
-        throw new IOException( "No such file" );
+        throw new IOException( "No such file (" + path + ")" );
     }
 }
diff --git a/src/main/java/dan200/computercraft/core/filesystem/FileMount.java b/src/main/java/dan200/computercraft/core/filesystem/FileMount.java
index b201ff862..59ce3d826 100644
--- a/src/main/java/dan200/computercraft/core/filesystem/FileMount.java
+++ b/src/main/java/dan200/computercraft/core/filesystem/FileMount.java
@@ -129,7 +129,7 @@ public void list( @Nonnull String path, @Nonnull List<String> contents ) throws
         {
             if( path.length() != 0 )
             {
-                throw new IOException( "Not a directory" );
+                throw new IOException( "Not a directory (" + path + ")" );
             }
         }
         else
@@ -148,7 +148,7 @@ public void list( @Nonnull String path, @Nonnull List<String> contents ) throws
             }
             else
             {
-                throw new IOException( "Not a directory" );
+                throw new IOException( "Not a directory (" + path + ")" );
             }
         }    
     }
@@ -178,7 +178,7 @@ public long getSize( @Nonnull String path ) throws IOException
                 }
             }
         }
-        throw new IOException( "No such file" );
+        throw new IOException( "No such file (" + path + ")" );
     }
     
     @Nonnull
@@ -193,7 +193,7 @@ public InputStream openForRead( @Nonnull String path ) throws IOException
                 return new FileInputStream( file );
             }
         }
-        throw new IOException( "No such file" );
+        throw new IOException( "No such file (" + path + ")" );
     }
     
     // IWritableMount implementation
@@ -207,7 +207,7 @@ public void makeDirectory( @Nonnull String path ) throws IOException
         {
             if( !file.isDirectory() )
             {
-                throw new IOException( "File exists" );
+                throw new IOException( "File exists (" + path + ")" );
             }
         }
         else
@@ -222,7 +222,7 @@ public void makeDirectory( @Nonnull String path ) throws IOException
 
             if( getRemainingSpace() < dirsToCreate * MINIMUM_FILE_SIZE )
             {
-                throw new IOException( "Out of space" );
+                throw new IOException( "Out of space (" + path + ")" );
             }
             
             boolean success = file.mkdirs();
@@ -232,7 +232,7 @@ public void makeDirectory( @Nonnull String path ) throws IOException
             }
             else
             {
-                throw new IOException( "Access denied" );
+                throw new IOException( "Access denied (" + path + ")" );
             }
         }
     }
@@ -242,7 +242,7 @@ public void delete( @Nonnull String path ) throws IOException
     {
         if( path.length() == 0 )
         {
-            throw new IOException( "Access denied" );
+            throw new IOException( "Access denied (" + path + ")" );
         }
         
         if( created() )
@@ -276,7 +276,7 @@ private void deleteRecursively( File file ) throws IOException
         }
         else
         {
-            throw new IOException( "Access denied" );
+            throw new IOException( "Access denied (" + path + ")" );
         }
     }
     
@@ -288,7 +288,7 @@ public OutputStream openForWrite( @Nonnull String path ) throws IOException
         File file = getRealPath( path );
         if( file.exists() && file.isDirectory() )
         {
-            throw new IOException( "Cannot write to directory" );
+            throw new IOException( "Cannot write to directory (" + path + ")" );
         }
         else
         {
@@ -296,7 +296,7 @@ public OutputStream openForWrite( @Nonnull String path ) throws IOException
             {
                 if( getRemainingSpace() < MINIMUM_FILE_SIZE )
                 {
-                    throw new IOException( "Out of space" );
+                    throw new IOException( "Out of space (" + path + ")" );
                 }
                 else
                 {
@@ -321,11 +321,11 @@ public OutputStream openForAppend( @Nonnull String path ) throws IOException
             File file = getRealPath( path );
             if( !file.exists() )
             {
-                throw new IOException( "No such file" );
+                throw new IOException( "No such file (" + path + ")" );
             }
             else if( file.isDirectory() )
             {
-                throw new IOException( "Cannot write to directory" );
+                throw new IOException( "Cannot write to directory (" + path + ")" );
             }
             else
             {
@@ -334,7 +334,7 @@ else if( file.isDirectory() )
         }
         else
         {
-            throw new IOException( "No such file" );
+            throw new IOException( "No such file (" + path + ")" );
         }
     }
     
@@ -361,7 +361,7 @@ private void create() throws IOException
             boolean success = m_rootPath.mkdirs();
             if( !success )
             {
-                throw new IOException( "Access denied" );
+                throw new IOException( "Access denied (" + path + ")" );
             }
         }
     }
diff --git a/src/main/java/dan200/computercraft/core/filesystem/FileSystem.java b/src/main/java/dan200/computercraft/core/filesystem/FileSystem.java
index cab9abdac..662d14842 100644
--- a/src/main/java/dan200/computercraft/core/filesystem/FileSystem.java
+++ b/src/main/java/dan200/computercraft/core/filesystem/FileSystem.java
@@ -110,7 +110,7 @@ public void list( String path, List<String> contents ) throws FileSystemExceptio
                 }
                 else
                 {
-                    throw new FileSystemException( "Not a directory" );
+                    throw new FileSystemException( "Not a directory (" + path + ")" );
                 }
             }
             catch( IOException e )
@@ -137,7 +137,7 @@ public long getSize( String path ) throws FileSystemException
                 }
                 else
                 {
-                    throw new FileSystemException( "No such file" );
+                    throw new FileSystemException( "No such file (" + path + ")" );
                 }
             }
             catch( IOException e )
@@ -157,7 +157,7 @@ public InputStream openForRead( String path ) throws FileSystemException
                 }
                 else
                 {
-                    throw new FileSystemException( "No such file" );
+                    throw new FileSystemException( "No such file (" + path + ")" );
                 }
             }
             catch( IOException e )
@@ -172,7 +172,7 @@ public void makeDirectory( String path ) throws FileSystemException
         {
             if( m_writableMount == null )
             {
-                throw new FileSystemException( "Access denied" );
+                throw new FileSystemException( "Access denied (" + path + ")" );
             }
             try
             {
@@ -181,7 +181,7 @@ public void makeDirectory( String path ) throws FileSystemException
                 {
                     if( !m_mount.isDirectory( path ) )
                     {
-                        throw new FileSystemException( "File exists" );
+                        throw new FileSystemException( "File exists (" + path + ")" );
                     }
                 }
                 else
@@ -199,7 +199,7 @@ public void delete( String path ) throws FileSystemException
         {
             if( m_writableMount == null )
             {
-                throw new FileSystemException( "Access denied" );
+                throw new FileSystemException( "Access denied (" + path + ")" );
             }
             try
             {
@@ -219,14 +219,14 @@ public OutputStream openForWrite( String path ) throws FileSystemException
         {
             if( m_writableMount == null )
             {
-                throw new FileSystemException( "Access denied" );
+                throw new FileSystemException( "Access denied (" + path + ")" );
             }
             try
             {
                 path = toLocal( path );
                 if( m_mount.exists( path ) && m_mount.isDirectory( path ) )
                 {
-                    throw new FileSystemException( "Cannot write to directory" );
+                    throw new FileSystemException( "Cannot write to directory (" + path + ")" );
                 }
                 else
                 {
@@ -251,7 +251,7 @@ public OutputStream openForAppend( String path ) throws FileSystemException
         {
             if( m_writableMount == null )
             {
-                throw new FileSystemException( "Access denied" );
+                throw new FileSystemException( "Access denied (" + path + ")" );
             }
             try
             {
@@ -270,7 +270,7 @@ public OutputStream openForAppend( String path ) throws FileSystemException
                 }
                 else if( m_mount.isDirectory( path ) )
                 {
-                    throw new FileSystemException( "Cannot write to directory" );
+                    throw new FileSystemException( "Cannot write to directory (" + path + ")" );
                 }
                 else
                 {
@@ -557,16 +557,16 @@ public synchronized void copy( String sourcePath, String destPath ) throws FileS
         sourcePath = sanitizePath( sourcePath );
         destPath = sanitizePath( destPath );
         if( isReadOnly( destPath ) ) {
-            throw new FileSystemException( "Access denied" );
+            throw new FileSystemException( "Access denied (" + destPath + ")" );
         }
         if( !exists( sourcePath ) ) {
-            throw new FileSystemException( "No such file" );
+            throw new FileSystemException( "No such file (" + sourcePath + ")" );
         }
         if( exists( destPath ) ) {
-            throw new FileSystemException( "File exists" );
+            throw new FileSystemException( "File exists (" + destPath + ")" );
         }
         if( contains( sourcePath, destPath ) ) {
-            throw new FileSystemException( "Can't copy a directory inside itself" );
+            throw new FileSystemException( "Can't copy a directory inside itself (" + sourcePath + ")" );
         }
         copyRecursive( sourcePath, getMount( sourcePath ), destPath, getMount( destPath ) );
     }
@@ -730,7 +730,7 @@ private MountWrapper getMount( String path ) throws FileSystemException
         }
         if( match == null )
         {
-            throw new FileSystemException( "Invalid Path" );
+            throw new FileSystemException( "Invalid Path (" + path + ")" );
         }
         return match;
     }
diff --git a/src/main/java/dan200/computercraft/core/filesystem/JarMount.java b/src/main/java/dan200/computercraft/core/filesystem/JarMount.java
index 3bc4988e7..f63457b88 100644
--- a/src/main/java/dan200/computercraft/core/filesystem/JarMount.java
+++ b/src/main/java/dan200/computercraft/core/filesystem/JarMount.java
@@ -203,7 +203,7 @@ public void list( @Nonnull String path, @Nonnull List<String> contents ) throws
         }
         else
         {
-            throw new IOException( "Not a directory" );
+            throw new IOException( "Not a directory (" + path + ")" );
         }
     }
     
@@ -215,7 +215,7 @@ public long getSize( @Nonnull String path ) throws IOException
         {
             return file.getSize();
         }
-        throw new IOException( "No such file" );
+        throw new IOException( "No such file (" + path + ")" );
     }
 
     @Nonnull
@@ -243,6 +243,6 @@ public InputStream openForRead( @Nonnull String path ) throws IOException
                 // treat errors as non-existance of file
             }
         }
-        throw new IOException( "No such file" );
+        throw new IOException( "No such file (" + path + ")" );
     }
 }