FLAC refers to an open-source audio format that stands for Free Lossless Audio Codec, meaning free lossless audio compression.
A Flac file is an audio file that has been compressed using the FLAC method. Much like the MP3 format, audio data is compressed. However, unlike MP3, the FLAC method compresses without loss and is therefore especially recommended for audiophiles and sound processing. While the MP3 format is limited to 48KHz / 16Bit, Flac can also encode 96KHz / 24Bit.
For most systems, there are playback, RIP & conversion programs that control FLAC. In addition, there is now also a whole range of devices that FLAC can play. More information can be found here: http://flac.Sourceforge.Net/links.Html#hardware. Meanwhile, there are certainly more than the devices listed there. Some programs need a plugin to handle FLAC.
Winamp is especially recommended for Windows because it can play and create FLAC.
Most often resolving problems with opening FLAC files is very simple. Just install an appropriate program that supports such files. All of the listed programs support FLAC files, but may vary in offered function and purpose. Some programs may be capable only of viewing contents of FLAC 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 FLAC 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 Toast 11 applications is not on the list, select "Browse" option in order to manually locate the directory where Toast 11 has been installed.
Sometimes problems with opening FLAC files may not lie with the application itself, but can arise due to other causes, such as: