ANN file format description

Many people often share .ann files without providing instructions on how to use them. This can make it difficult for users to determine which program is compatible for editing, converting, or printing .ann files. To address this issue, we have created this page to offer assistance and guidance on handling .ann files. We provide information on compatible software, editing instructions and conversion options to help users effectively interact with .ann files.

Our aim is to simplify the process and promote seamless use of the .ann file format.

4 filename extension(s) found in our database.

.ann - Windows Help Annotations

The ANN data files are related to WinHelp. The ANN file is a Microsoft Windows Help Annotations. Windows Help is a component of Windows that is accessible from various Windows programs. The WinHelp seems to be no longer supported.

Category:Data files
Magic:- / -

Windows Help Annotations related extensions:

  • chq Help Combined Full-text Search
  • hlp Windows Help File

.ann - ENVI Annotation Data

The ANN data files are related to ENVI. The ANN file is an ENVI Annotation Data. ENVI image analysis software is used by GIS professionals, remote sensing scientists, and image analysts to extract meaningful information from imagery to make better decisions.

Category:Data files
Magic:- / -

ENVI Annotation Data related extensions:

  • adj ADS40 Orientation Adjustment Data
  • ads ADS40 Header Data
  • bll ENVI Bad Lines List
  • cam ADS40 Camera Calibration Data
  • cff ENVI Calibration Factors Data
  • cnt ENVI PPI Count Data

.ann - King-FIX Data

The ANN data files are related to King-FIX. The ANN file is a King-FIX Data. King-FIX is a FidoNet file echo processor software. The King-FIX seems to be no longer supported.

Category:Data files
Magic:- / -

King-FIX Data related extensions:

  • gm3 SAPS File
  • odock ObjectDock Theme
  • cs JCAMP Chemical Structure Data
  • ewd3 InstallShield Internal Data
  • vf VTBuilder Vegetation Data
  • dsb eSignal DSB Data

.ann - Zemax Annotations Data

The ANN data files are related to Zemax. The ANN file is a Zemax Annotations Data. Zemax is an optical design program that is used to design and analyze imaging systems such as camera lenses, as well as illumination systems.

Category:Data files
Magic:- / -

Zemax Annotations Data related extensions:

  • agf Zemax ASCII Glass Catalog
  • bgf Zemax Binary Glass Catalog
  • bim Zemax Binary Image Surface Data
  • bsdf Zemax Scattering Distribution Data
  • cfg Zemax Configuration Data
  • ele Zemax Element Drawing Settings

Be careful.

It is important to understand that the .ann file extension is not limited to a particular set of applications. Other programs besides the intended ones can also use the .ann extension to create files. This includes potentially harmful programs or malware that may generate .ann files for various purposes. Be especially cautious with .ann files coming from untrusted or unknown sources.

Can't open a .ann 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 an extension, you receive the following message:

Select an app to open this .ann file

To set the .ann file association in Windows 11, you can follow these steps

  1. Open the Settings app by clicking on the Start menu and selecting the gear icon.
  2. In the Settings app, click on System and then select Apps from the left-hand side menu.
  3. Scroll down and click on the Default apps option.
  4. Under the Default apps section, you will find various categories such as Email, Web browser, and Music player.
  5. Locate the category that matches the file type you want to associate, such as Photos for image files or Video player for video files.
  6. Click on the current default app listed under the category. A list of available apps will appear.
  7. Choose the app you want to set as the default for that file type. If the desired app is not listed, click on More apps to see additional options or click on Look for an app in the Microsoft Store to search for apps in the Store.
  8. After selecting the app, it will become the default choice for opening files of that type.

It's worth mentioning that you don't always need to set .ann file association. Many applications can open .ann files without requiring any specific file association to be set.

The .ann file extension is often given incorrectly

Based on searches conducted on our site in the past year, we have compiled a list of the most common misspellings. These frequent misspellings can cause confusion and hinder search accuracy. Our goal in providing this list is to help users find the right information more easily and enhance their overall search experience on our website.

These misspellings were the most common in the past year:

abn, agn, ahn, amn, an, anb, ang, anh, anm, nan, nn, znn

Is it possible that the filename extension is misspelled?

There is a possibility that the .ann filename extension is misspelled. To assist users in identifying potential errors, we provide a list of similar file extensions in our database.

Filename extensions similar to .ann:

Operating systems

At, we strive to provide a seamless user experience by ensuring compatibility with a wide range of operating systems. The following is a comprehensive list of the operating systems currently supported by

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

Verified by

The verification conducted by the team ensures that the information presented is accurate, reliable, and thoroughly researched. Users can rely on as a trusted source of information, knowing that their team's dedication to verification and quality control provides a dependable resource for staying informed. is not liable for the content and accuracy of external links, even if we exercise careful control over them.

If you find the information on this .ann page useful, please feel free to link to this page. >> ANN file