Many important files within Microsoft Windows have structures that are undocumented. One of the principals of computer forensics is that all analysis methodologies must be well documented and repeatable, and they must have an acceptable margin of error. Currently, there are a lack of open source methods and tools that forensic analysts can rely upon to examine the data found in proprietary Microsoft files.
Many computer crime investigations require the reconstruction of a subject’s internet activity. Since this analysis technique is executed regularly, we researched the structure of the data found in Internet Explorer activity files (index.dat files). The Pasco application (from the latin word meaning “browse”) was developed to examine the contents of Internet Explorer’s cache files.
Pasco will parse the information in an index.dat file and output the results in a field delimited manner so that it may be imported into your favorite spreadsheet program.
Pasco Free Download 
Pasco is a forensic utility that parses the contents of an index.dat file in Windows.
As such, it will retrieve and export the data found in this file into text files.
Pasco is written in C# and utilizes the WPF+Win32 Toolkit framework. This framework provides a simplified interface to Win32 system features such as registry editing.
Pasco can read the content of an index.dat file and export its results to a text file. This text file can then be used to populate a spreadsheet with the data retrieved from the file.
The output format is flexible and can be tailored to a spreadsheet. The text file generated can also be opened in a text editor and the contents copied into an Excel document or exported to other formats such as a csv.
Get the latest version of Pasco here:
To try out all the features of Pasco visit:
A set of Git repositories contains the source code for Pasco and includes an example index.dat file.
Feel free to fork and improve this project.
Included in the Source Code:
There are two different Git repositories containing Pasco source code.
This repository contains source code for Pasco 0.7.3
This repository contains source code for Pasco 0.8.0 and newer
Here is the source code we were able to obtain:
Pasco and the source code provided below are released under the GNU General Public License.
This applies to both the source code and executables for any type of operating system.
Pasco source code
This is not the only set of files provided to us for our research. We have also received the file pirangolf-Pasco.exe.
This executable is provided to us by the same author.
To contribute to this project please read the source
Advantages of Pasco
Transforms an index.dat file into a worksheet.
Allows for the export of data to excel or another database.
Gives a representation of the internet sessions.
Disadvantages of Pasco
Uses an interpreted language (PASCO) which makes it slow, and not a true native format.
Because it is an interpreted language, it can be slow and is not amenable to automation.
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This Add-on is freeware, may be used for both the education and research purposes. The database is updated every Wednesday,
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In addition to the code, information for each case is also available.
The program has been installed using the interface provided by IE 11.
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The Add-on is supported by the admin of Internet Advertising Bureau.
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Pasco is a free utility that will extract data from index.dat files located within your default Internet Explorer directory.
– Detailed Detailed explanation of the data found within index.dat files
– Filter data to show only data that will be useful for you
– Filter data by Page Title, Page URL, Query, and Search String
– View page title as a hyperlink
– Support for Windows 2000/NT/XP
Pasco requires Internet Explorer 6 or higher.
Download the file and double click it to install the application.
Open Index.dat files with Pasco:
From the main Pasco screen, select “Open Index.dat files”. Pasco will then open your default Internet Explorer folder (C:\Documents and Settings\All Users\Start Menu\Programs\Internet Explorer) and will process your Internet Explorer index.dat files. Once complete, a text file will appear in the Pasco window.
Navigate to the directory where the index.dat files are located.
Double click the index.dat file.
On the ‘Filter’ page of Pasco, select the items that you would like to examine (see example in the image). Use the ‘Find’ button to search for the text you entered in the ‘Search String’ box.
Click on the hyperlink found in the page title box.
Click on the hyperlink found in the box located to the left of the page URL box.
Enter whatever text you would like to examine in the box located below the ‘Query’ text.
You will receive three types of data regarding your search. If’results found’ is displayed in the top section of Pasco (see example in image), then your results will be returned. If ‘there are no results’ is displayed in the section of results, then there was no data found.
If ‘query completed’ is displayed in the top section, then the search for your specified text is completed. If you click on the hyperlink found in the page title box, your will be returned to the search results section.
Click the ‘Return to Filter’ button to return to the items that you selected.
The section on the left of the
What’s New In?
This program parses the Index.dat file and exports the results into a spreadsheet format. You can preview the results in a pop-up window before exporting.
* Exports plain text for Excel, CSV, and Tab-Delimited files.
* Display plain text in a pop-up window for easy visualization.
* Edit Exported Results
* Handles large index.dat files
* Parses all of the Index.dat cache files in a directory
* Text viewers on all of the relevant columns
* Sort Results by Column
* Ability to sort and/or delete rows
* Ability to export to csv
* Selects order to sort by
Pasco is available on SourceForge.net as a free download.
This download includes both the executable and documentation.
Pasco works on Windows and is tested for:
* Windows 2000, Windows NT, Windows XP, Windows Server 2003, Windows Vista,
Windows 7, Windows 8, Windows 10
*.NET Framework 2.0 or later
Pasco uses the native Windows Installer (MSI) format and follows the standard installation rules. This should be sufficient to install and update the program. Pasco is not dependent on a third party Internet connection to operate. It will download the necessary files while installing.
A single EXE file is installed. No DELETE or INSTALL is necessary to remove Pasco.
Pasco is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version.
Please see the LICENSE file for more information on licensing.
Because of the way Pasco stores information in its index.dat files, the program can parse all of the files in a directory structure.
Using the program is simple.
Use the shortcut menu to start or stop the program.
There is also a start menu option that when invoked will allow you to view, export, and sort the results.
Pasco also supports profiles. It is simple to add a new profile to the Pasco program to facilitate a special set of import functions.
If there is any doubt about the contents of a Pasco index.dat file, you can always view the results using the “View Results” option from the main menu.
2GB of RAM or more
20GB of hard drive space (plus 20GB for the game’s installer)
An internet connection
A copy of the original Big Buck Bunny animated movie, installed in your Steam library
Navigate to Steam -> Games -> Right-click on Big Buck Bunny -> Properties
Select the Local Files tab
Select the Delete Local Content button
Click the Local Files tab again
Select the “0” (first) entry in the drop