What is DLG.exe?

The genuine DLG.exe file is a software component of BVRP Software TestLine by Avanquest Software.
BVRP Software TestLine is program used to detect whether a digital or analog phone line is connected to the PC modem. DLG.exe is a background process associated with BVRP Software TestLine. This is not an essential Windows process and can be disabled if known to create problems. BVRP Software TestLine is usually installed through various telephony software programs. The program is no longer necessary on modern computers as most modern modems are digital. This program is known to cause issues with other hardware and software products. The program can be safely removed. Avanquest Software is a French company that develops and distributes consumer software products primarily for the Windows platform. Avanquest was founded in 1984 by Bruno Vanryb and Roger Politis, and was originally called BVRP referring to the founders' initials. The company currently employs over 500 people and is headquartered in Paris, France.

DLG stands for Digital Line Detection G

The .exe extension on a filename indicates an executable file. Executable files may, in some cases, harm your computer. Therefore, please read below to decide for yourself whether the DLG.exe on your computer is a Trojan that you should remove, or whether it is a file belonging to the Windows operating system or to a trusted application.

Click to Run a Free Scan for DLG.exe related errors

DLG.exe file information

Windows Task Manager with DLG
DLG.exe process in Windows Task Manager

The process known as Digital Line Detection belongs to software BVRP Software TestLine or Digital Line Detect or Digital Line Detection or VSIP Interop Assembly Redist by BVRP Software ( or Avanquest Software (

Description: DLG.exe is not essential for the Windows OS and causes relatively few problems. The DLG.exe file is located in a subfolder of "C:\Program Files" (generally C:\Program Files\Digital Line Detect\). Known file sizes on Windows 10/8/7/XP are 24,576 bytes (69% of all occurrences), 50,688 bytes and 5 more variants. 
It is not a Windows core file. The program has no visible window. The program is loaded during the Windows boot process (see Registry key: MACHINE\User Shell Folders, MACHINE\Run, User Shell Folders). Therefore the technical security rating is 44% dangerous, however you should also read the user reviews.

Uninstalling this variant: You have the option to do the following:
  1) uninstall Digital Line Detect from your computer using the Control Panel applet Uninstall a Program
  2) contact Customer Service
  3) search for an update on the vendor’s website.

Recommended: Identify DLG.exe related errors

External information from Paul Collins:

Important: Some malware camouflages itself as DLG.exe, particularly when located in the C:\Windows or C:\Windows\System32 folder. Therefore, you should check the DLG.exe process on your PC to see if it is a threat. We recommend Security Task Manager for verifying your computer's security. This was one of the Top Download Picks of The Washington Post and PC World.


User Comments

Not as bad as you might think
Best I can figure, since it is Unsigned it must come with package that many ppl are on with Time-Warner Digital, as it includes Digital Phones.
Read this link for a definitive answer
  HopeThisHelps   (further information)
This file message "Digital Line detected" would come up because QTtask.exe would try to link for update when no network was hooked up. Using 98% of system the Quicktime file would try to connect through modem too. Recommend disabling auto update checkbox in QT. Other apps may be doing the same thing.
Digital line detection software from Avanquest Software, installed on Lenovo notebooks with internal modem
  John   (further information)
logitech desktop manager
It saved a bunch oof porn that wasn't even my taste to the computer then it did skeet on my face
  Skeetface   (further information)
AFAIK- serves no purpose. I used MSCONFIG and disabled it from starting up.
  Another Annoyed Dell Customer  
More comments can be found here:
    (further information)

Rating chart

Summary: Average user rating of DLG.exe: based on 26 votes with 9 reviews. 15 users think DLG.exe is essential for Windows or an installed application. 3 users think it's probably harmless. 4 users think it's neither essential nor dangerous. 2 users suspect danger. 2 users think DLG.exe is dangerous and recommend removing it. 4 users don't grade DLG.exe ("not sure about it").

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Best practices for resolving DLG issues

A clean and tidy computer is the key requirement for avoiding problems with DLG. This means running a scan for malware, cleaning your hard drive using 1cleanmgr and 2sfc /scannow, 3uninstalling programs that you no longer need, checking for Autostart programs (using 4msconfig) and enabling Windows' 5Automatic Update. Always remember to perform periodic backups, or at least to set restore points.

Should you experience an actual problem, try to recall the last thing you did, or the last thing you installed before the problem appeared for the first time. Use the 6resmon command to identify the processes that are causing your problem. Even for serious problems, rather than reinstalling Windows, you are better off repairing of your installation or, for Windows 8 and later versions, executing the 7DISM.exe /Online /Cleanup-image /Restorehealth command. This allows you to repair the operating system without losing data.

To help you analyze the DLG.exe process on your computer, the following programs have proven to be helpful: ASecurity Task Manager displays all running Windows tasks, including embedded hidden processes, such as keyboard and browser monitoring or Autostart entries. A unique security risk rating indicates the likelihood of the process being potential spyware, malware or a Trojan. BMalwarebytes Anti-Malware detects and removes sleeping spyware, adware, Trojans, keyloggers, malware and trackers from your hard drive.

Other processes

DLG.exe [all]