SDII file format description

Many people share .sdii files without attaching instructions on how to use it. Yet it isn’t evident for everyone which program a .sdii file can be edited, converted or printed with. On this page, we try to provide assistance for handling .sdii files.

1 filename extension(s) found in our database.

.sdii - Sound Designer 2 Audio

The SDII audio files are related to Avid Pro Tools. The SDII file is a Sound Designer 2 Audio. The SDII (Sound Designer II, sometimes seen abbreviated as SD2) is a monophonic/stereophonic audio file format, originally developed by Digidesign for their Macintosh-based recording/editing products.

Avid Pro Tools
Audio files
- / -
Sound Designer 2 Audio related extensions:
Korg Mono/Poly Program
DTS Encoded Audio File
Nord Stage 2 Program
Sharp X68000 PCM Data
Hippel-COSO Music
Renoise Song Data

Naturally, other applications may also use the .sdii file extension. Even harmful programs can create .sdii files. Be especially cautious with .sdii files coming from an unknown source!

Can't open a .sdii file?

When you double-click a file to open it, Windows examines the filename extension. If Windows recognizes the filename extension, it opens the file in the program that is associated with that filename extension. When Windows does not recognize a filename extension, you receive the following message:

Windows can't open this file:


To open this file, Windows needs to know what program you want to use to open it. Windows can go online to look it up automatically, or you can manually select one from a list of programs that are installed on your computer.

To avoid this error, you need to set the file association correctly.

The .sdii file extension is often given incorrectly!

According to the searches on our site, these misspellings were the most common in the past year:

dii, sdi, sii, ssii

Is it possible that the filename extension is misspelled?

Similar file extensions in our database:

System Deployment Image
18 Wheels of Steel Haulin Truck Data
Seadragon Index Data
ArcGIS Spatial and Attribute Index
TrialDirector Load Data
Fidonet Software Distribution Network Info

Operating systems currently supports the following operating systems:

Windows XP/Vista, Windows 7/8/10, Windows 11, CentOS, Debian GNU/Linux, Ubuntu Linux, FreeBSD, macOS, Mac OS X, iOS, Android

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