.SED File Extension

IExpress Self Extraction Directive File

Developer Microsoft
4.2  |  20 Votes

What is a SED file?

File created by IExpress Wizard, a built-in Windows program used for creating Windows installers; contains options used for building a software installation package (.EXE file); includes the files to build into the package, the output package filename, popup messages for the installation process, and various other options.

More Information

SED files are used by the IExpress Wizard to build self-extracting executables. They are often used for creating software distributions.

The IExpress program (iexpress.exe) is located in the C:\​Windows\​System32\​ directory.

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Programs that open SED files


Nintendo 3DS System Key

Developer Nintendo
3.6  |  7 Votes

Movable.sed is an encrypted system file used by the Nintendo 3DS. It is a device-specific key that allows the 3DS to access system and game data. Movable.sed is transferred between devices as part of 3DS System Transfers. Additionally, an exploit in the file allows gamers to load custom applications onto their 3DSes.

More Information

The data access key movable.sed contains is related to your device's Friend Code. Thus, enthusiastic 3DS homebrew developers have been able to crack the key's encryption. Using this exploit, homebrew gamers can install custom 3DS firmware, such as boot9strap, and then use that firmware to install other custom applications.

How to open a SED file

Movable.sed is not meant to be opened. To retrieve your movable.sed file from your Nintendo 3DS, you can use the Seedminer web tool.

Programs that open or reference SED files


Sed Script

Developer The GNU Project
3.2  |  10 Votes

Script used by sed (streams editor), a Unix command line utility used for filtering and modifying text; stores one or more statements, which contain pattern matches and replacements; used for storing reusable sed statements.

More Information

SED files are used with the following syntax, where -f is the option for specifying a sed script: sed -f file.sed inputfile

Programs that open or reference SED files


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