The ending SEA stands for self extracting archive, so self-extracting archive. This proprietary archive format, used only on the Mac, is primarily generated by the StuffIt Deluxe software. Like any other archive format, it is used to store and compress data such as images, documents or program files in an archive file.
SEA files bring along their unpacker to sit or zip files, so that later Stuffit is no longer needed. Starting an SEA file starts the unpacking process. Some older SEA files created on Mac OS 9 or earlier may not be automatically unzipped on MAC OSX. In this case, it is recommended, for example, to install the StuffIt Expander and use it to open the SEA file.
Of course, under Windows, SEA files can not be started because they are not executable Windows files. However, you can use the Stuffit Expander (for Windows) to extract SEA files.
Most often resolving problems with opening SEA files is very simple. Just install an appropriate program that supports such files. All of the listed programs support SEA files, but may vary in offered function and purpose. Some programs may be capable only of viewing contents of SEA 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 SEA 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 Micro StuffIt Deluxe applications is not on the list, select "Browse" option in order to manually locate the directory where Micro StuffIt Deluxe has been installed.
Sometimes problems with opening SEA files may not lie with the application itself, but can arise due to other causes, such as: