RT_ File Extension

What is RT_ file?

Full format name of files that use RT_ extension is Microsoft Windows Winhelp Compressed. Microsoft Corporation defined the Microsoft Windows Winhelp Compressed format standard. RT_ files are supported by software applications available for devices running Windows. Files with RT_ extension are categorized as Misc Files files. The Misc Files subset comprises 6033 various file formats. Microsoft Windows Help is by far the most used program for working with RT_ files. Microsoft Windows Help software was developed by Microsoft Corporation, and on its official website you may find more information about RT_ files or the Microsoft Windows Help software program.

Programs which support RT_ file extension

Programs that can handle RT_ files are as follows. Files with RT_ suffix can be copied to any mobile device or system platform, but it may not be possible to open them properly on target system.

How to open file with RT_ extension?

There can be multiple causes why you have problems with opening RT_ files on given system. Fortunately, most common problems with RT_ files can be solved without in-depth IT knowledge, and most importantly, in a matter of minutes. The following is a list of guidelines that will help you identify and solve file-related problems.

Step 1. Install Microsoft Windows Help software

The most common reason for such problems is the lack of proper applications that supports RT_ files installed on the system. The solution to this problem is very simple. Download Microsoft Windows Help and install it on your device. Above you will find a complete listing of programs that support RT_ files, classified according to system platforms for which they are available. The safest method of downloading Microsoft Windows Help installed is by going to developer’s website (Microsoft Corporation) and downloading the software using provided links.

Step 2. Check the version of Microsoft Windows Help and update if needed

You still cannot access RT_ files although Microsoft Windows Help is installed on your system? Make sure that the software is up to date. Sometimes software developers introduce new formats in place of that already supports along with newer versions of their applications. This can be one of the causes why RT_ files are not compatible with Microsoft Windows Help. The most recent version of Microsoft Windows Help is backward compatible and can handle file formats supported by older versions of the software.

Step 3. Set the default application to open RT_ files to Microsoft Windows Help

If you have the latest version of Microsoft Windows Help installed and the problem persists, select it as the default program to be used to manage RT_ on your device. The process of associating file formats with default application may differ in details depending on platform, but the basic procedure is very similar.

Change the default application in Windows

• Right-click the RT_ file and choose Open with option
• Select Choose another app → More apps
• To finalize the process, select Look for another app on this PC entry and using the file explorer select the Microsoft Windows Help installation folder. Confirm by checking Always use this app to open RT_ files box and clicking OK button.

Change the default application in Mac OS

• From the drop-down menu, accessed by clicking the file with RT_ extension, select Information
• Proceed to the Open with section. If its closed, click the title to access available options
• Select Microsoft Windows Help and click Change for all...
• A message window should appear informing that This change will be applied to all files with RT_ extension. By clicking Continue you confirm your selection.

Step 4. Ensure that the RT_ file is complete and free of errors

You closely followed the steps listed in points 1-3, but the problem is still present? You should check whether the file is a proper RT_ file. Problems with opening the file may arise due to various reasons.

1. The RT_ may be infected with malware – make sure to scan it with an antivirus tool.

If the RT_ is indeed infected, it is possible that the malware is blocking it from opening. Scan the RT_ file as well as your computer for malware or viruses. If the scanner detected that the RT_ file is unsafe, proceed as instructed by the antivirus program to neutralize the threat.

2. Check whether the file is corrupted or damaged

If the RT_ file was sent to you by someone else, ask this person to resend the file to you. It is possible that the file has not been properly copied to a data storage and is incomplete and therefore cannot be opened. It could happen the the download process of file with RT_ extension was interrupted and the file data is defective. Download the file again from the same source.

3. Check if the user that you are logged as has administrative privileges.

There is a possibility that the file in question can only be accessed by users with sufficient system privileges. Log out of your current account and log in to an account with sufficient access privileges. Then open the Microsoft Windows Winhelp Compressed file.

4. Verify that your device fulfills the requirements to be able to open Microsoft Windows Help

The operating systems may note enough free resources to run the application that support RT_ files. Close all running programs and try opening the RT_ file.

5. Verify that your operating system and drivers are up to date

Latest versions of programs and drivers may help you solve problems with Microsoft Windows Winhelp Compressed files and ensure security of your device and operating system. Outdated drivers or software may have caused the inability to use a peripheral device needed to handle RT_ files.

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