| File Extension: | RT_ |
| File Type Description: | Microsoft WinHelp Compressed Help Document |
| File Type Developer: | Microsoft Corporation |
| Primary Associated Software: | Microsoft Windows Help |
| Primary Software Developer: | Microsoft Corporation |
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Microsoft WinHelp Compressed Help Document files are the most popular type of files to carry the RT_ file extension, originally developed by Microsoft Corporation for Microsoft Windows Help. Internal website statistics show that RT_ files are most popular with users in United States and those running the Windows 10 operating system. Most of these users are running the Google Chrome web browser.
 | Microsoft Windows Help by Microsoft Corporation |
| Windows 10 | Windows 11 | Windows 6 | Windows 8.1 |
 | Windows |
| Extension | File Type Developer | File Category | File Type Description |
|---|---|---|---|
| .RC_ | Microsoft Corporation | Data Files | Microsoft WinHelp Compressed Help Document |
| .FSF | Microsoft Corporation | Temporary Files | Microsoft Office Cache Data |
| .ALC | Ableton | Audio Files | Ableton Live Clip File |
| .XIP | Apple | Compressed Files | MacOS Signed Archive |
| .BTAB | Microsoft Corporation | Text Files | Base Guitar Tabulature Data |
| .PS2XML | Microsoft Corporation | Developer Files | Windows PowerShell File |
| .PML | Microsoft Corporation | Data Files | Process Monitor Log File |
| .OLB | Microsoft Corporation | Uncommon Files | OLE Object Library |
| .BLF | Microsoft Corporation | System Files | CLFS Base Log File |
| .CHK | Sophos | Data Files | InterCheck Checksum Database |
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