# Files with .fs extension in ruby on rails application

**URL:** <https://www.ruby-forum.com/t/files-with-fs-extension-in-ruby-on-rails-application/153138>\
**Category:** Rails\
**Created:** [November 12, 2008, 3:44pm UTC](https://www.ruby-forum.com/t/files-with-fs-extension-in-ruby-on-rails-application/153138 "2008-11-12T15:44:49Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![rpm](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/r/c57346/32.png) [@rpm](https://www.ruby-forum.com/u/rpm)\
**Post date:** [November 12, 2008, 3:44pm UTC](https://www.ruby-forum.com/t/files-with-fs-extension-in-ruby-on-rails-application/153138/1 "2008-11-12T15:44:49Z")

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I am using Spiceworks, an application made with Ruby on Rails. It has  
some files with .fs extension but i don´t know what are this files and  
with wich tools are generated. ¿Could someone say me something about it?

I attached one of this files.

Thank you.

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<div class="post-metadata">

**Author:** ![rpm](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/r/c57346/32.png) [@rpm](https://www.ruby-forum.com/u/rpm)\
**Post date:** [November 12, 2008, 9:14pm UTC](https://www.ruby-forum.com/t/files-with-fs-extension-in-ruby-on-rails-application/153138/2 "2008-11-12T21:14:35Z")

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> **[FS File Extension - What is it? How to open an FS file?](https://filext.com/file-extension/FS)**
>
> All about FS images. Details for the FS file extension and how to open an FS file. Filext.com

On Nov 12, 9:44 am, Raul M. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid)

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<div class="post-metadata">

**Author:** ![rpm](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/r/c57346/32.png) [@rpm](https://www.ruby-forum.com/u/rpm)\
**Post date:** [December 6, 2008, 2:51am UTC](https://www.ruby-forum.com/t/files-with-fs-extension-in-ruby-on-rails-application/153138/3 "2008-12-06T02:51:57Z")

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Raul M. wrote:

> I am using Spiceworks, an application made with Ruby on Rails. It has  
> some files with .fs extension but i don´t know what are this files and  
> with wich tools are generated. ¿Could someone say me something about it?
> 
> I attached one of this files.
> 
> Thank you.

This appears to be an archive file… somewhat similar to a gzipped tar  
file, but not quite. It has a rather long header and starts with what I  
assume is a magic string: “[depot]”. What follows is a VERY long and  
sparse header followed by a series of records consisting of a filename  
(with relative path), a length, and compressed data.

I pulled apart several Spiceworks file to verify these findings and they  
are consistent. I would post more info, but I’d rather not be in any  
sort of legal trouble - and would very much like Spiceworks to continue  
as a freely available ad-supported package - even if it is closed  
source.