diff --git a/repository/Grafoscopio/GrafoscopioBrowser.class.st b/repository/Grafoscopio/GrafoscopioBrowser.class.st
index 3f259db..323ed28 100644
--- a/repository/Grafoscopio/GrafoscopioBrowser.class.st
+++ b/repository/Grafoscopio/GrafoscopioBrowser.class.st
@@ -12,15 +12,16 @@ Class {
 	#name : #GrafoscopioBrowser,
 	#superclass : #Object,
 	#instVars : [
-		'\r\t\t\t\tbrowser',
+		'browser',
 		'explorer',
 		'mainTree',
 		'workingFile',
-		'\r\t\t\t\tfossil',
+		'fossil',
 		'localRepository',
 		'remoteRepository',
 		'repositoryUser',
-		'repositoryPassword\r\t\t\t\tpandoc'
+		'repositoryPassword',
+		'pandoc'
 	],
 	#classVars : [
 		'DefaultUbakyeBrowser'
@@ -202,6 +203,20 @@ browser
 				on: $s entitled: 'Accept' with: [:text | text text ]].
 ]
 
+{ #category : #'system-support' }
+GrafoscopioBrowser >> configurePandoc [
+	"Stablish where is located pandoc according to the operative system and the input of the user"
+	| fileStream |
+	fileStream := UITheme builder 
+							fileOpen: 'Coloque la ruta de pandoc'.
+							
+	fileStream isNil ifTrue: [ ^nil ].
+	pandoc := fileStream name asFileReference fullName.
+
+
+
+]
+
 { #category : #'system-support' }
 GrafoscopioBrowser >> configureSettings [
 	"Stablish several 'global' settings according to the operative system"
@@ -256,13 +271,18 @@ GrafoscopioBrowser >> exportAsHtml [
 	| markdownFileLocation htmlFileLocation |	
 	markdownFileLocation := ((workingFile parent) / workingFile basenameWithoutExtension) fullName, '.markdown'.
 	htmlFileLocation := ((workingFile parent) / workingFile basenameWithoutExtension) fullName, '.html'.
-	Smalltalk platform name = 'unix'
-		ifTrue: [ OSProcess command: 'exec ', pandoc, ' ', markdownFileLocation , ' --standalone -o ' , htmlFileLocation ].
-	Smalltalk platform name = 'Win32'
-		ifTrue: [ OSProcess command: pandoc, ' ', markdownFileLocation , ' --standalone -o ' , htmlFileLocation ].
-	
+	pandoc notNil 
+		ifTrue:[
+			Smalltalk platform name = 'unix'
+				ifTrue: [ 
+					OSProcess command: 'exec ', pandoc, ' ', markdownFileLocation , ' --standalone -o ' , htmlFileLocation.
+					self inform: 'Archivo exportado como html'. ].
+			Smalltalk platform name = 'Win32'
+				ifTrue: [ OSProcess command: pandoc, ' ', markdownFileLocation , ' --standalone -o ' , htmlFileLocation ]]
+		ifFalse: [self configurePandoc ].
+
 	self customKeys.	
-	self inform: 'Archivo exportado como html'.
+	
 ]
 
 { #category : #persistence }
@@ -300,12 +320,12 @@ GrafoscopioBrowser >> installPandoc [
 	
 ]
 
-{ #category : #persistence }
+{ #category : #'graphical interface' }
 GrafoscopioBrowser >> open [
 	"Opens a new browser with a default tree and assigns a default draft file for storing it.
 	This is changed when the file is saved with the 'Save as' menu option"
 	| draftsLocation |
-	self configureSettings.
+	"self configureSettings."
 	self buildBrowser.
 	mainTree := GrafoscopioNode new.
 	mainTree becomeDefaultTree.
@@ -511,6 +531,8 @@ GrafoscopioBrowser >> treeOn: constructor [
 		act: [self updateSystem] entitled: 'Grafoscopio > Actualizar';
 		act: [self updateSystem] entitled: 'Grafoscopio > Actualizar prerrequisitos';
 		act: [:x | x printString inspect] entitled: 'Grafoscopio > Actualizar herramientas externas';
+		act: [self configurePandoc] entitled: 'Grafoscopio > Herramientas externas > Definir ruta a pandoc';
+		act: [:x | x printString inspect] entitled: 'Grafoscopio > Herramientas externas > Definir ruta a fossil';		
 		act: [:x | x printString inspect] entitled: 'Grafoscopio > Acerca de...'.
 
 ]