.FOL is a file extension. It is used by 2 known file types. The most common .FOL file type is a database file from First Choice Database. .FOL was used in early Windows versions. It stores data in fields with types and values. This data can be queried and used for reports. .FOL files are now extremely rare. They are no longer supported.
.FOL is also a settings file extension. It is used by Windows Mail and Windows Live Mail. .FOL stores user settings for folders in those programs. .FOL files do not contain emails.
You can download FirstOut to open .FOL database files. Visit the developer website to download it. Verify you have the latest version. The .FOL settings files don’t need an additional program. Windows will open them automatically.
Other file types may also use the .FOL extension for different types of data. If you get an error when opening a .FOL file, you may need to install the program that created it. You can also try converting the .FOL file to a more usable format. Database .FOL files can be converted with FirstOut or first2html.