The .ots file extension is most commonly used by the OpenOffice spreadsheet application. OpenOffice provides users with an XML-based freeware suite of software that is similar to the software applications found in Microsoft Office. The OTS files contain template files used by the OpenOffice spreadsheet application. These files are similar in nature to Microsoft Excel template files.
The .ots file extension is also used for OtsJuke sound files and Yamaha PSR-9000 files.
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If you have additional information about the OTS file format or software that uses files with the OTS suffix, please do get in touch - we would love hearing from you.