G99 Files: What It Is and How to Open It

If you've received G99 files and can't open them for some reason, and you want to know what it is and what to do about it, keep on reading!

G99 files are typically a type of binary file used by certain software, and many software packages can share a common file extension. In the case of files with an G99 extension, a popular software package such as HEC-RAS Geometry File can open it.


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How to Open Your G99 File

The easiest way to open file extension G99 is to try downloading some of the most popular software that uses G99 extension. The most well-known program associated with G99 files is HEC-RAS Geometry File.

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As you may already know, if you have HEC-RAS Geometry File, you can simply double-click on your G99 and it should open up. But what if your software does not open the file?

First, try right-clicking on the file and selecting "Open With..." and select HEC-RAS Geometry File from the dropdown list. If that didn't work, go into the file associations settings of Windows, and set HEC-RAS Geometry File to open G99 files by default.

Please note that G99 file extensions may not be limited to HEC-RAS Geometry File only. You could always do a Google search to find other software that uses G99 files and download that to try to open your file.

Still no luck? Get in touch with the developer of the software title to see if they can be of assistance. If your software does not have an identified developer in the chart below, a quick web search of the software title should give you some clues on who to contact.

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HEC-RAS Geometry File U.S. Army Corps of Engineers


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1File types that are unsupported can be opened in binary format.

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