File Extension SLS3

  • Full name
    Microsoft Excel 3 For Mac Template
  • Developer
    Microsoft Corporation
Have you encountered a problem with a SLS3 file? Don’t you know which program opens a file with this extension? You will find all the information you need about working with a SLS3 file here. In the further part of this page we have added a list of programs that should open your SLS3 file. It is enough you choose a proper application for your operating system, download and install it.


The file extension SLS3 was used by version 3 of the spreadsheet application Microsoft Excel for the Apple Macintosh for templates. Several versions of Excel for the Apple MacIntosh used the extension sls for templates followed by the version number of Excel.

The default version of this type of file is xlt or since the 2007 version of the Microsoft Office xltx.

Programs which can open a SLS3 file

How to open a SLS3 file? Advice and guidance

Absolutely most often appearing reason that prevents you from opening the SLS3 file is the lack of a proper application to support it in your operating system. It is notably the first thing you need to address. When one of the programs to support a SLS3 file from the list is already installed, you can try to rerun the file. The system should display a message asking you to choose a primary application to support SLS3 files. At this point we are looking for disk space where the application was installed in and we can link it with a SLS3 file. Since then, our operating system will use the selected program to support all SLS3 files.

Other issues

Despite the described problem with SLS3 there may be many more problems. If the existing operations were not effective, get involved with the following matters:

- verify that the SLS3 file is not damaged and that it has been downloaded or copied in whole
- verify that the file has a file extension that has not been intentionally changed (for example, if it do not contain other information than its extension suggests)
- make sure again whether the SLS3 file type is linked in the operating system with a proper program
- make sure that the file is not infected with a virus and you have up to date software and drivers.

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