Kinds of RT_ Files

Principal RT_ Type

.RT_

File Ext:	.rt_
Type:	Microsoft WinHelp Compressed Help Document

The file stores compressed help document for Microsoft Windows WinHelp application (also referred to as Windows Help) that is used to author help documents.

Developer:	Microsoft Corporation
Group:	Data Files
Registry Key:	HKEY_CLASSES_ROOT\.rt_

Software Programs That Open The Microsoft WinHelp Compressed Help Document:

Microsoft Windows Help by Microsoft Corporation

Windows

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Troubleshooting Problems Opening RT_ Files

Frequent RT_ Opening Issues

Microsoft Windows Help Not Present

You encounter an error message such as "%%os%% Can't Open RT_ Files" when trying to open your RT_. If so, it typically means that you don't have Microsoft Windows Help installed for %%os%%. You won't be able to double-click to open your RT_ because your OS doesn't know what to do with it.

Tip: If you have another software that you know opens RT_ files, you can select it by hitting the "Show Apps" button.

Microsoft Windows Help Requires Update

Your Microsoft WinHelp Compressed Help Document file is incompatible with Microsoft Windows Help because you might have the wrong version installed. Installing the latest version of Microsoft Windows Help from Microsoft Corporation is recommended. This issue mainly occurs when your Microsoft WinHelp Compressed Help Document file was created by a newer version of Microsoft Windows Help than you have on your PC.

Tip: You can sometimes get hints about the right program version by right-clicking on the RT_ file, selecting "Properties", and looking at the version information.

Regardless, most of the RT_ file opening problems relate to not having the right version of Microsoft Windows Help installed.

Associated Difficulties Loading RT_ Files

Errors opening Microsoft WinHelp Compressed Help Document files can still occur even with the latest Microsoft Windows Help software installed on your computer. Other RT_ opening errors can be created by other system problems inside of %%os%%. Additional factors include:

• Invalid RT_ file references in the Windows Registry (the "phonebook" of the Windows Operating System)
• Deletion of the RT_ file description from the Registry by mistake
• Partial installation of Microsoft Windows Help that did not fully complete
• File corruption affecting your RT_ file
• Malware-tainted RT_ file can't be opened
• Device drivers of the hardware associated with your RT_ file are corrupt or out-of-date
• Too many applications are open on your PC to load your Microsoft WinHelp Compressed Help Document file successfully