Without the associated sdw files, a SGL file can not be used.
This format was used by older versions of StarOffice Writer. Newer variants use the OpenDocument format odm.
StarOffice was originally developed by the German company Star Division. The word processor StarWriter presented the basis of the package that first appeared for MS-DOS and subsequently for Windows. In 1999, Star Division was acquired by Sun Microsystems and ported StarOffice to various platforms. The components of the office suite have been changed several times. In 2000, the source code was published by StarOffice, from which the open source project OpenOffice.Org was created. Nevertheless, there was a commercial variant that offered additional support. From version 8 StarOffice supports the OpenDocument standard.
Most often resolving problems with opening SGL files is very simple. Just install an appropriate program that supports such files. All of the listed programs support SGL files, but may vary in offered function and purpose. Some programs may be capable only of viewing contents of SGL 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 SGL 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 StarOffice applications is not on the list, select "Browse" option in order to manually locate the directory where StarOffice has been installed.
Sometimes problems with opening SGL files may not lie with the application itself, but can arise due to other causes, such as: