Filename extensions

MS Access

An app package.

Office auto recovered files.

A .bacpac files is similar to a .dacpac but also stores data that belongs to a database.

nc

Scripts for Celestia

Base64 decoded X.509 certificate.

See also Privacy Enhanced Mails.

Compiled (or compressed?) HTML

Suffix for Windows Control Panel applications.

A cpl file is nothing more than a DLL with a .cpl rather than .dll file extension.

(Windows) credential backup file.

Ceritifcates, see also Privacy Enhanced Mails.

Excel (Office?) Chart Template, by default stored in

A DAC (SQL Server data-tier application) package.

A dacpac file is basically a zip file that stores XML files which describe an SQL Server database (tables and their columns, stored procedures, triggers etc.)

A .dacpac file can be unpaced with DacUnpack.exe

See also .bacpac

See .deb file format.

An MS Word document, with macros. Compare with .docx.

An MS Word document, without macros. Compare with .docm.

Data Source Name file.

See connecting to data source

DTSX stands for Data Transformation Services Package XML. A .dtsx file stores the instructions for the processing of a data flow, including transformations and optional processing steps, from its points of origin to its points of destination.

In .NET, a .dtsx file can be parsed with the LoadPackage method of the Microsoft.SqlServer.Dts.Runtime.Application class. (The method returns a Microsoft.SqlServer.Dts.Runtime.Package object)

See also DTUtil.exe /File … and .ispac files.

dwg is an abbrevation of drawing.

Like dxf, it is developed by Autodesk and a vector graphic file format. Unlike dxf, however, dwg seems to supportd 3D.

Drawing interchange (or exchange) format.

dxf is a vector graphic file format. The format was developed by Autodesk and is used for CAD.

A file that was compressed with gzip.

An Office effect schema. Files are stored below C:\Program Files\Microsoft Office\root\Document Themes vv\Theme Effects

Event trace log file (aka trace log), used in Windows.

An .etl file storse trace messages that are gneerated during one or more trace sessions.

See logman.exe and tracerpt.exe.

Event Tracing files for Windows

%SystemRoot%\Logs\WindowsUpdate Agent uses Event Tracing for Windows (ETW) to generate diagnostic logs.

.evtx files seem to be some sort of Windows event log files and stored under C:\Windows\System32\winevt\Logs.

Height files, SRTM

Jupyter Notebook Document

Integration Services Project Deployment File Format.

An .ispac file contains the metadata of a data integration project.

See also SSISDeploy.exe and DTExec.exe, and .dtsx files

A Java archive.

The content of the .jar file is stored in the zip file format.

Terraform

.la files are libtool archive files. They're generally not needed on a Linux system.

Used for source definitions in /etc/apt/sources.list and /etc/apt/sources.list.d (one line format, compare .sources format).

SQL Server log files

Test file of SQL Server tool SQLIOSim

Windows shortcut (link) files

See also:

• Microsoft Open Specification: Shell Link (.LNK) Binary File Format
• Read an .lnk file with C++
• Get-Link.ps1

MDB

Primary data files of SQL Server.

Test file of SQL Server tool SQLIOSim

In Oracle this seems to be a binary message file.

Managment Saved Console: an MMC with a Snap In.

A Microsoft update package.

NetCDF

Secondary data files of SQL Server.

A NuGet package, stored in zip file format.

Office Data Connection files.

See connecting to data source and the saveAsODC method of the queryTable and pivotCache objects of Excel.

The information that is stored in such a connection file can also be stored in a workbookConnection object of an Excel workbook so that it local to the workbook.

A type library for Office. The o stands for object, not for Office.

A file that can be opened in Power Query Editor

Package config files, see the Linux shell command pkg-config.

Windows symbol files

So-called Privacy Enhanced Mails, typically used for certificates.

PNG World File Format

It stores georeferencing information for png raster maps, its file filename is equal to an other, also existing *.png file within the same directory.

A pgw file might be produced by, for example, psconvert.

See also http://www.feflow.info/html/help/default.htm

A PowerShell script

A PowerShell module manifest.

A PowerShell module.

Outlook: OST and PST files

Either a

• Python path configuration file (see the site module, or a
• machine learning model (a downloadable torchvision model?), created by PyTorch (See also torch.save() and torch.load().

A Python script file or Python module.

Compiled (or cached) Python modules

A Python DLL

Directory Search (see dsquery.dll).

An R file.

Same(?) as RData.

An R data file.

See also rda

SAS has a few suffixes that all start with .sas.

Microsoft SQL Server Compact

An Stellarium script file.

snk stands for strong name key and is used to apply a strong name to an assembly.

Used for source definitions in /etc/apt/sources.list and /etc/apt/sources.list.d (Deb822 fromat, compare .list format).

A tar archive.

An Office theme. Files are stored below C:\Program Files\Microsoft Office\root\Document Themes vv

A type library

See WebAssembly

A file in the wheel format, used for Python packages.

A compiled keymap file.

An Excel Add-In

An Excel Workbook that might store macros.

An Excel Workbook, without macros.

xpi stands for cross-platform install, is pronounced as zippy, seems to be a Mozilla standard and is a zip file in disguise.

For Firefox, such *.xpi are installed in the extensions directory below the profile folder.

man 7 suffixes

Windows registry:

• HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\FileExts
• HKEY_CLASSES_ROOT\.ext
• The values of Extension in the subkeys of the registry key HKEY_CLASSES_ROOT\MIME\Database\Content Type

MIME

/etc/mime.types

The cmd.exe built in command assoc.

Remove filename extensions in cmd.exe batch files

The default (Windows) applications for a given extension can be assigned with Windows setting ms-settings:defaultapps, then clicking Choose default apps by file type.

The value of HideFileExt under the registry key HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced must be set to 0 in order to show file extensions in the explorer.

Associate an extension with a language in VS Code.

The Windows Settings panel Choose default apps by file type allows to associate an extension with an application (program executable).

The PowerShell module winFileExtProgId.

PowerShell: Change file extensions in a directory.

The .NET method System.IO.Path.ChangeExtension() modifies a file name's extension.

The Wikidata property P1195.

Wikidata - P1195: file extension