.DEF File Extension

Developer: IObit

File Type: IOBit Malware Fighter Definitions File

Popularity:

Can't open a file with the .DEF ending? It is essential to understand that such files open only specific programs. If the .DEF file does not open, it means that the reason is that your PC does not have the appropriate programs to open this file, or the file association has certain damages.

To get more information about this extension, read this material. To fix all the problems, a unique tool PC Repair will help you. You can download it here.

What does the .DEF file mean?

.DEF file is part of the Web Files used in Windows (Windows 11, Windows 10, Windows 7, Windows 8 / 8.1, Windows Vista, Windows XP).

.DEF def
Developer: IObit
File Type: IOBit Malware Fighter Definitions File
Category: Data Files
Format: Binary

Open .DEF File

You can open a .DEF file with a double-click. By installing PC Repair, you will be able to open the file, but the file association must be set correctly. Do Windows keep asking you which program you should use to open the file? Then the problem lies in broken file associations, which appear due to Windows registry errors.

Fix .DEF file association errors

Fix the problem quickly and automatically with these actions:

  • Step 1: Click the download button here to download the automatic recovery tool.
  • Step 2: Now click Start Scanning to identify potential issues
  • Step 3: Look at the results of the scan, then click on Fix items.
4.365.534 downloads

File Size: 2.8 MB, Download time: < 1 min. on DSL/ADSL/Cable

This tool is compatible with: Windows XP, Windows Vista, Windows 7, Windows 8/8.1, Windows 11, Windows 10

Warning

Manual troubleshooting is not recommended if the user does not have sufficient knowledge. To avoid problems, use automatic tools.

This page is available in other languages: Deutsch | Español | Italiano | Français | Indonesia | Nederlands | Nynorsk | Português | Русский | Українська | Türkçe | Malay | Dansk | Polski | Română | Suomi | Svenska | Tiếng việt | Čeština | العربية | ไทย | 日本語 | 简体中文 | 한국어

File Association Fix Tool for .DEF Extension
  • Download Size: (2.8 MB)
  • Downloaded: 4.365.534 times
download   FIX .DEF ERRORS

The fix tool repairs corrupted/broken file associations helping the system to open a .DEF file with the correct program. The fix tool is fast and easy-to-use.

See more information about Outbyte and unistall instrustions. Please review Outbyte EULA and Privacy Policy.

warn There are 3 other file types using the .DEF file extension
file  .def

Module-Definition File

file  .def

SmartWare II Data File

file  .def

M.U.G.E.N. Character Definition File

Other file extensions
.otx

theWord Encrypted Old Testament Text Module

.py

Python Script

.ucf

WebEx Media File

.m1pg

iFinish Video Clip

.cb7

Comic Book 7-Zip Archive