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What is an SD_ File?

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Question: What is an SD_ File?

Did you find an SD_ file on your computer and wonder what program should open it? Maybe someone emailed you an SD_ file but you're not sure how to use it. Perhaps you tried to open the SD_ file but Windows told you that it could not open it.

Before you can open an SD_ file (assuming it's even a file format that's intended to be viewed or edited), you'll need to determine what kind of file the .SD_ file extension refers to.

Answer: A file with the SD_ file extension is an Audio Utility Midimach Compressed file.

Other types of files may also use the SD_ file extension. If you know of any additional file formats that use the .SD_ extension, please let me know so I can update this information.

How To Open an SD_ File:

The easiest way to open an SD_ file is to double-click on it and let your PC decide which default application should open the file. If no program opens the SD_ file then you probably don't have an application installed that can view and/or edit SD_ files.

Warning: Take great care when opening executable file formats received via email or downloaded from websites you're not familiar with. See my List of Executable File Extensions for a listing of file extensions to avoid and why.

As of this writing, I don't have information on any specific applications that will view SD_ files or open SD_ files for editing. If you know of any, please send me a quick email and let me know the name of the program so I can update this page.

Tip: Use Notepad or another text editor to open the SD_ file. Many files are text-only files meaning no matter the file extension, a text editor may be able to properly display the file's contents. This may or may not be the case with SD_ files but it's worth a try.

If you find that an application on your PC does try to open the SD_ file but it's the wrong application or if you would rather have another installed program open SD_ files, see my How To Change the Default Program for a Specific File Extension guide for making that change in Windows.

How To Convert an SD_ File:

There are two main ways to attempt to convert an SD_ file to another file type:

The first option involving opening the SD_ file in its native program is preferable because it's both easier and will probably result in a more accurate file conversion. Of course if you don't have a program that opens SD_ files, a third-party file conversion tool (the second option) could be very useful.

Important: You cannot usually change a file extension (like the SD_ file extension) to one that your computer recognizes and expect the newly renamed file to be usable. An actual file format conversion using one of the methods described above must take place in most cases.

Still Having Problems Opening or Using an SD_ File?

See Get More Help for information about contacting me on social networks or via email, posting on tech support forums, and more. Let me know what kinds of problems you're having with opening or using the SD_ file and I'll see what I can do to help.

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