Important File Extensions Questions and Answers

Answer: A

Correct answer: .reg

.reg is a Windows Registry file: a text file of registry keys and values that is merged into the registry when opened. Because it edits system settings directly, a bad .reg file can leave Windows unusable.

Answer: C

Correct answer: .xls

.xls is the Excel workbook format up to Office 2003; .xlsx replaced it from Office 2007.

Answer: D

Correct answer: .msi

.msi is a Microsoft Installer package - a database of files and instructions that the Windows Installer service reads to install a program.

Answer: C

Correct answer: .rpm

.rpm stands for RPM Package Manager, originally Red Hat Package Manager. It carries software for RPM-based distributions such as Red Hat, Fedora and SUSE, in the way that .deb serves Debian and Ubuntu.

Answer: C

Correct answer: .torrent

A .torrent file holds the metadata - file names, sizes, checksums and tracker address - that a BitTorrent client needs in order to find and verify the actual content.

Answer: B

Correct answer: .cab

A .cab file is a Windows Cabinet archive, used by installers to hold compressed files.

Answer: A

Correct answer: .db

.db is the generic database file extension, used by SQLite among others. The other three are not standard database extensions.

Answer: D

Correct answer: Excel Add-In File

.xll is an Excel add-in written as a dynamic link library - the second l reflects that. Ordinary macro add-ins use .xla or .xlam.

Answer: B

Correct answer: .pps

.pps is a PowerPoint Slide Show: the same content as a .ppt, but saved so that opening it starts the presentation instead of the editor.

Answer: C

Correct answer: .csv

.csv is a comma-separated values file - plain text in which each line is a record and commas separate the fields, which is why almost every program can read it.