How to Retrieve .FAS Files Lost After System Failures or Software Crashes

Have files been deleted due to a user’s error or software error? Have you formatted a disk by accident and need to know how to recover the files? Read our .FAS file recovery guide for Windows, MacOS, Android and IOS in 2024.

How to Retrieve .FAS Files Lost After System Failures or Software Crashes
Data Recovery Tool

What is a .FAS file?

Compiled script written in AutoLISP, a variation of the LISP programming language used specifically for the extension of AutoCAD software; often used for creating macros that automate common processes within AutoCAD; can be used for distributing utilities that add new features to the software.

What Are Common Causes of ".FAS" Files Lost or Failure?

There can be several common causes of ".FAS" files lost or failure:

  1. Accidental deletion: Users may accidentally delete ".FAS" files while performing file management tasks, such as cleaning up their computer or emptying the recycle bin.
  2. File system corruption: Issues with the file system, such as disk errors or improper shutdowns, can lead to corruption of ".FAS" files, making them inaccessible or unusable.
  3. Virus or malware attacks: Viruses or malware can infect ".FAS" files and cause them to become corrupted or deleted.
  4. Software or hardware issues: Problems with software applications or hardware devices used to create or store ".FAS" files can result in data loss or file corruption.
  5. Power outages: Sudden power outages or power surges while working with ".FAS" files can lead to file system errors or data loss.
  6. Operating system errors: Errors or glitches within the operating system can cause ".FAS" files to become lost or corrupted.
  7. Human error: Mistakes made by users, such as accidental formatting of storage devices, improper handling of files, or incorrect file transfers, can result in the loss or failure of ".FAS" files.
  8. Physical damage: Physical damage to storage devices, such as hard drives or memory cards, can lead to the loss or corruption of ".FAS" files.
  9. Software conflicts: Incompatibilities or conflicts between different software applications can cause ".FAS" files to become inaccessible or fail to open.
  10. File synchronization issues: Problems during file synchronization processes, such as interrupted transfers or conflicts between different versions of ".FAS" files, can result in data loss or file corruption.

How to recover lost ".FAS" files?

Sometimes while working with a computer, laptop or other stationary or mobile devices, you may encounter various bugs, freezes, hardware or software failures, even in spite of regular updates and junk cleaning. As a result, an important ".FAS" file may be deleted.

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🧺 How to Recover Files and Folders After Sending Them to the Recycle Bin and Deleting? (Windows 11)

🧺 How to Recover Files and Folders After Sending Them to the Recycle Bin and Deleting? (Windows 11)

By no means should you think that the only way to recover a ".FAS" file is always to create it once more.

Use programs for recovering ".FAS" files if a file was lost after accidental or deliberate deleting, formatting the memory card or the internal storage, cleaning the storage device, after a virus attack or a system failure.

Programs to recover ".FAS" files

Looking for a way to get files back? In cases when files were deleted and they cannot be restored by using standard operating system tools, use Hetman Partition Recovery.

Partition Recovery™ 4.9
The tool recovers data from any devices, regardless of the cause of data loss.
Download

Follow the directions below:

  1. Download Hetman Partition Recovery, install and start the program.

  2. The program will automatically scan the computer and display all hard disks and removable drives connected to it, as well as physical and local disks.

    File Recovery Software

  3. Double-click on the disk from which you need to recover ".FAS" files, and select analysis type.

    Hetman Partition Recovery - Analysis Type

  4. When the scanning is over, you will be shown the files for recovery.

    Hetman Partition Recovery - Files that Can be Restored

  5. To find a file you need, use the program’s interface to open the folder it was deleted from, or go to the folder "Content-Aware Analysis" and select the required file type.

    Hetman Partition Recovery - Deep Scan

  6. Select the files you have been looking for and click "Recovery".

    File Recovery Software - Files List for Recovery

  7. Choose one of the methods for saving the files and recover them.

    Saving recovered files in Hetman Partition Recovery

How to open file with ".FAS" extension?

Looking for how to open a stereo compiled Fast-Load AutoLISP File image file file?

Programs that open ".FAS" files

Windows
Autodesk AutoCAD 2020 Autodesk AutoCAD 2020

Additional Information

  • File type: Compiled Fast-Load AutoLISP File

  • File extension: .FAS

  • Developer: Autodesk

  • Category: Executable Files

  • Format: Binary

  • HEX: 0D 0A 20 46 41 53 34 2D 46 49 4C 45 20 3B 20 44 6F 20 6E 6F 74 20 63 68 61 6E 67 65 20 69 74 21 0D 0A

  • ASCII: FAS4-FILE ; Do not change it!

  • File types that use the extension .FAS:

    • Compiled Fast-Load AutoLISP File

    • QuickSilver Fast Save Lisp File

    • FASTA Sequence File

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Comments (1)

  • Hetman Software: Data Recovery
    Hetman Software: Data Recovery 18.12.2019 13:52 #
    Leave a comment if you have any questions about Recovering lost .FAS files after deleting, cleaning or formatting!
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Vladimir Artiukh

Author: Vladimir Artiukh, Technical Writer

Vladimir Artiukh is a technical writer for Hetman Software, as well as the voice and face of their English-speaking YouTube channel, Hetman Software: Data Recovery for Windows. He handles tutorials, how-tos, and detailed reviews on how the company’s tools work with all kinds of data storage devices.

Oleg Afonin

Editor: Oleg Afonin, Technical Writer

Oleg Afonin is an expert in mobile forensics, data recovery and computer systems. He often attends large data security conferences, and writes several blogs for such resources as xaker.ru, Elcomsoft and Habr. In addition to his online activities, Oleg’s articles are also published in professional magazines. Also, Oleg Afonin is the co-author of a well-known book, Mobile Forensics - Advanced Investigative Strategies.

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Questions and answers

  • What is the purpose of the ".FAS Recovery" file and how does it work?

    The ".FAS Recovery" file is used in Autodesk AutoCAD software. It serves as a backup file that contains the AutoLISP source code for a custom program or routine written in AutoLISP programming language.

    The purpose of the ".FAS Recovery" file is to provide a means of recovering the AutoLISP source code in case the original ".FAS" file is lost or corrupted. It acts as a safety net to restore the custom program to its original state.

    When AutoCAD loads a ".FAS" file, it compiles the AutoLISP code into a compiled format known as a ".FAS" file. This compiled file is then loaded and executed by AutoCAD. However, during the compilation process, a ".FAS Recovery" file is created alongside the original ".FAS" file.

    If the original ".FAS" file becomes inaccessible or damaged, AutoCAD can use the ".FAS Recovery" file to recover the AutoLISP source code. AutoCAD will decompile the ".FAS Recovery" file to generate a new ".FAS" file, which can then be loaded and executed as usual.

    In summary, the ".FAS Recovery" file acts as a backup of the AutoLISP source code, allowing for recovery and recompilation of the custom program if needed.

  • How can one recover a corrupted or deleted ".FAS Recovery" file?

    Recovering a corrupted or deleted ".FAS Recovery" file can be challenging, but here are a few methods you can try:

    1. Check the Recycle Bin or Trash: If you accidentally deleted the file, it might still be in the Recycle Bin (Windows) or Trash (Mac). Simply open the respective folder and search for the file. If found, restore it to its original location.
    2. Use File Recovery Software: There are various file recovery software programs available online, such as Recuva, EaseUS Data Recovery Wizard, or Disk Drill. Install one of these tools, scan your computer's hard drive, and look for the ".FAS Recovery" file. If the file is recoverable, these tools can help you retrieve it.
    3. Check Backup and Recovery Solutions: If you regularly back up your files, check your backup storage locations or cloud services. Look for a previous version of the ".FAS Recovery" file that was saved before it got corrupted or deleted. Restore the older version if available.
    4. Contact Data Recovery Professionals: If the above methods fail, consider seeking assistance from professional data recovery services. They have specialized tools and expertise to recover lost or corrupted files. However, note that professional services can be costly.

    Remember, the success of file recovery depends on various factors like the file's original location, the duration since it was deleted or corrupted, and the actions taken after deletion. Hence, it is crucial to act promptly and avoid using the affected storage device to prevent overwriting the deleted file.

  • Are there any potential risks or drawbacks associated with using ".FAS Recovery" files for data recovery?

    There are a few potential risks and drawbacks associated with using ".FAS Recovery" files for data recovery:

    1. Compatibility: ".FAS Recovery" files may not be compatible with all data recovery software or tools. It is important to ensure that the software you are using supports this file format before attempting recovery.
    2. Limited Support: ".FAS Recovery" files may not be widely supported or have extensive documentation available. This can make it challenging to find assistance or troubleshoot any issues that may arise during the recovery process.
    3. File Corruption: There is a possibility that the ".FAS Recovery" files themselves may become corrupted or damaged, leading to incomplete or unsuccessful data recovery. It is crucial to have proper backups and ensure the integrity of these files.
    4. Incomplete Recovery: Depending on the specific circumstances, using ".FAS Recovery" files may not guarantee a complete recovery of all lost data. Some files or data may remain unrecoverable, especially if they were severely damaged or overwritten.
    5. Time-consuming Process: Data recovery using ".FAS Recovery" files can be a time-consuming process, especially if the files are large or fragmented. It may require significant computational resources and time to reconstruct and recover the data successfully.
    6. Data Security: When using ".FAS Recovery" files, there is a risk of exposing sensitive or confidential information during the recovery process. It is essential to ensure proper security measures are in place to protect the recovered data.

    Overall, while ".FAS Recovery" files can be useful for data recovery, it is crucial to consider these potential risks and drawbacks before relying solely on this method. It is advisable to consult with a professional data recovery service or expert to assess the best approach for your specific data recovery needs.
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