A daily updated filename extension database!

DDY file extension

The table below provides useful information about the .ddy file extension. It answers questions such as:

  • What is the .ddy file?
  • What program do I need to open a .ddy file?
  • How can the .ddy file be opened, edited or printed?
  • How can I convert .ddy files to another format?

We hope you find this page helpful and a valuable resource!

1 extension(s) and 0 alias(es) found in database

✅ ASHRAE Design Conditions Design Day Data

DDY file is an ASHRAE Design Conditions Design Day Data.
DDY format description not yet available
Category: Data files
Mime-type: application/octet-stream
Magic number: -
Magic string: -
Sample: -
DDY aliases:
DDY related links:
DDY related extensions:

Other types of files may also use the .ddy file extension.

🚫 The .ddy file extension is often given incorrectly!

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

cdy, dcy, dd, ddg, ddj, ddt, ddu, dry, dsy, rdy, sdy, wdy

Is it possible that the filename extension is misspelled?

We found the following similar file extensions in our database:

OMA Download Descriptor
C64 Doodle Image
MAP GMS Installation Document
DucatiDiag Data File
Deltadrive GRS Database
Cinderella Construction File
WinDev Run-Time Template
XAIRON Organizer Diary Data
NETSCAN Decay Search Results
Besta Electronic Dictionary Video

🔴 Can't open a .ddy 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 cannot open this file:


To open this file, Windows needs to know what program you want to use to open it...

If you don't know how to set the .ddy file association, check the FAQ.

🔴 Can I change the extension of files?

Changing the filename extension of a file is not a good idea. When you change a file's extension, you change the way programs on your computer read the file. The problem is, changing the file extension does not change the file format.

If you have helpful information about the .ddy file extension, write to us!

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