Opening an F99 File

The F99 file type is primarily associated with HEC-RAS.

F99	File extension: F99
	File type:	Flow File

What is an F99 file?

F99 files mostly belong to HEC-RAS by U.S. Army Corps of Engineers. Hydrologic Engineering Centers River Analysis System (HEC- RAS) is a one-dimensional steady flow hydraulic model designed to aid hydraulic engineers in channel flow analysis and floodplain determination. The results of the model can be applied in floodplain management and flood insurance studies. These files can have extensions from F01 through F99.

How to open F99 files

You need a suitable software like HEC-RAS to open an F99 file. You need a suitable software like HEC-RAS from U.S. Army Corps of Engineers to open an F99 file. Without proper software you will receive a Windows message "How do you want to open this file?" or "Windows cannot open this file" or a similar Mac/iPhone/Android alert. If you cannot open your F99 file correctly, try to right-click or long-press the file. Then click "Open with" and choose an application. You can also display a F99 file directly in the browser:. Just drag the file onto this browser window and drop it.

Online F99 Text Viewer

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Can't Open Your .F99 File? Try These Steps

Because .F99 files originate from various programs, they aren't universally openable.

Identify the Source: If received from a civil engineer, it is likely a Flow File for river modeling. Otherwise, it may be a generic data export.
Check the Header: Open the file in a text editor or hex viewer to inspect the first lines:
- Readable hydraulic parameters suggest a HEC-RAS file.
- "PK" indicates a zipped archive.
- Garbled text means a proprietary binary format.
Use the Original Software: The original program is usually required. For flow data, use HEC-RAS by the U.S. Army Corps of Engineers. If uncertain, ask the sender.
Use this Webpage: Drag and drop your file into our viewer to detect its format, extract text or metadata, and preview contents.

Technical Data for F99 File Extension

Identifier:

Hex: 46 6C 6F 77 20 54 69 74 6C 65 3D, ASCII: Flow.Title= (provided by TrID database)

Related files:

f01, f03, f05

an f99 Flow File is a special file format by U.S. Army Corps of Engineers and should only be edited and saved with the appropriate software.

How to solve problems with F99 files

Associate the F99 file extension with the correct application.
Update your software that should actually open flow files. Because only the current version supports the latest F99 file format. Search, therefore, e.g. on the U.S. Army Corps of Engineers manufacturer website after an available HEC-RAS update.
To make sure that your F99 file is not corrupted or virus-infected, get the file again and scan it with Google's virustotal.com.
Click here to open your .F99 file online - secure, fast, and no downloads needed.