The file extension TGA marks images in TruVision TARGA format. The TARGA format supports up to 32 bits per pixel (with alpha channel information) and can store not only the image information but also various metadata such as date, author or gamma value.
The Targa format offers the possibility of lossless but weak RLE compression and is therefore rarely used. Only in the video sector is TARGA used even more.
In addition to the standard ending TGA, there are also the very rarely used endings vst, vda, ivb and targa. On the Mac, the extension tpic is used.
Most often resolving problems with opening TGA files is very simple. Just install an appropriate program that supports such files. All of the listed programs support TGA files, but may vary in offered function and purpose. Some programs may be capable only of viewing contents of TGA files or offer file conversion options, but may not be capable of editing such files.
It is possible that although a compatible program has been installed on user’s system, it is not used by the system to open it. This may happen because no default application was associated with this type of files. To associate TGA files with given application, select "Open with" from drop-down menu (accessed by right-clicking on the file). Then select from the list the program or application you want to be used to open this type of file. If the Apple Preview applications is not on the list, select "Browse" option in order to manually locate the directory where Apple Preview has been installed.
Sometimes problems with opening TGA files may not lie with the application itself, but can arise due to other causes, such as: