Trio Office is the free office software in 2019 and offers an alternative to Word, Excel & PowerPoint. It's compatible with Microsoft Office (Word, Excel, PowerPoint & Txt), Google Docs, Google Sheets, Google Slides and OpenOffice format for Windows.

Trio Office can open & edit many kinds of files. For more detail, please refer to the following format list:

[Opening text documents]
In addition to OpenDocument formats (.odt, .ott, .oth, .odm, and .fodt), Word Writer can open the formats used by OpenOffice.org 1.x (.sxw, .stw, and .sxg), the following text document formats, and a variety of legacy formats not listed below:
* Microsoft Word 2007 - 2019 (.docx)
* Microsoft Word 6.0/95/97/2000/XP (.doc and .dot)
* Microsoft Word 2003 XML (.xml)
* Microsoft Word 2007 XML (.docx, .docm, .dotx, .dotm)
* Microsoft WinWord 5 (.doc)
* WordPerfect Document (.wpd)
* WPS 2000/Office 1.0 (.wps)
* .rtf, .txt, and .csv
* StarWriter formats (.sdw, .sgl, .vor)
* DocBook (.xml)
* Unified Office Format text (.uot, .uof)
* Ichitaro 8/9/10/11 (.jtd and .jtt)
* Hangul WP 97 (.hwp)
* T602 Document (.602, .txt)
* AportisDoc (Palm) (.pdb)
* Pocket Word (.psw)
* eBook (.pdb)
* Apple Pages 4 (.pages)
* HTML Document (.htm, .html)

[Opening spreadsheets]
In addition to OpenDocument formats (.ods, .ots, and .fods), Calc can open the formats used by OpenOffice.org 1.x (.sxc and .stc) and the following spreadsheet formats:
* Microsoft Excel 2007 - 2019 (.xlsx)
* Microsoft Excel 97/2000/XP (.xls, .xlw, and .xlt)
* Microsoft Excel 4.x - 5.0/95 (.xls, .xlw, and .xlt)
* Microsoft Excel 2003 XML (.xml)
* Microsoft Excel 2007 XML (.xlsx, .xlsm, .xltx, .xltm)
* Microsoft Excel 2007 binary (.xlsb)
* Lotus 1-2-3 (.wk1, .wks, and .123)
* Data Interchange Format (.dif)
* Rich Text Format (.rtf)
* Text CSV (.csv and .txt)
* StarCalc formats (.sdc and .vor)
* dBASE (.dbf)
* SYLK (.slk)
* Unified Office Format spreadsheet (.uos, .uof)
* .htm and .html files, including Web page queries
* Pocket Excel (pxl)
* Quattro Pro 6.0 (.wb2)
* Apple Numbers 2 (.numbers)

[Opening presentations]
In addition to OpenDocument formats (.odp, .odg, .otp, and .fopd), Impress can open the formats used by OpenOffice.org 1.x (.sxi and .sti) and the following presentation formats:
* Microsoft PowerPoint 2007 - 2019 (.pptx)
* Microsoft PowerPoint 97/2000/XP (.ppt, .pps, and .pot)
* Microsoft PowerPoint 2007 (.pptx, .pptm, .potx, .potm)
* StarDraw and StarImpress (.sda, .sdd, .sdp, and .vor)
* Unified Office Format presentation (.uop, .uof)
* CGM - Computer Graphics Metafile (.cgm)
* Apple Keynote 5 (.key)

[Opening PDF]
* Portable Document Format (.pdf)

[Opening graphic files]
In addition to OpenDocument formats (.odg and .otg), Draw can open the formats used by OpenOffice.org 1.x (.sxd and .std) and the following graphic formats:
* Adobe Photoshop (.psd)
* AutoCAD Interchange Format (.dxf)
* BMP JPEG JPG
* Corel Draw (.cdr)
* Corel Presentation Exchange (.cmx)
* DXF MET PGM RAS SVM XBM
* EMF PBM PLT SDA TGA XPM
* EPS PCD PNG SDD TIF
* Microsoft Publisher 98-2010 (*.pub)
* Microsoft Visio 2000-2013 (*.vdx; *.vsd; *.vsdm; *.vsdx)
* PCX PSD SGV
* TIFF GIF PCT PPM SGF VOR
* WordPerfect Graphics (*.wpg)

[Opening formula files]
In addition to OpenDocument Formula (.odf) files, Math can open the format (.sxm), StarMath, (.smf), and MathML (.mml) files.
When opening a Word document that contains an embedded equation editor object, if the option for it is checked in Tools > Options > Load/Save > Microsoft Office, the object will be automatically converted to a Trio Office Math object.

***File formats Trio Office can save to

[Saving text documents]
In addition to OpenDocument formats (.odt and .ott), Word Writer can save in these formats:
* OpenOffice.org 1.x Text Document (.sxw)
* OpenOffice.org 1.x Text Document Template (.stw)
* Microsoft Word 2007 - 2019 (.docx)
* Microsoft Word 6.0, 95, and 97/2000/XP (.doc)
* Microsoft Word 2003 XML (.xml)
* Rich Text Format (.rtf)
* StarWriter 3.0, 4.0, and 5.0 (.sdw)
* StarWriter 3.0, 4.0, and 5.0 Template (.vor)
* Text (.txt)Text Encoded (.txt)
* Unified Office Format text (.uot, .uof)
* HTML Document (OpenOffice.org Writer) (.html and .htm)
* DocBook (.xml)
* AportisDoc (Palm) (.pdb)
* Pocket Word (.psw)

[Saving spreadsheet files]
In addition to OpenDocument formats (.ods and .ots), Calc can save in these formats:
* OpenOffice.org 1.x Spreadsheet (.sxc)
* OpenOffice.org 1.x Spreadsheet Template (.stc)
* Microsoft Excel 2007 - 2019 (.xlsx)
* Microsoft Excel 97/2000/XP (.xls and .xlw)
* Microsoft Excel 97/2000/XP Template (.xlt)
* Microsoft Excel 5.0 and 95 (.xls and .xlw)
* Microsoft Excel 2003 XML (.xml)
* Data Interchange Format (.dif)
* dBase (.dbf)SYLK (.slk)Text CSV (.csv and .txt)
* StarCalc 3.0, 4.0, and 5.0 formats (.sdc and .vor)
* Unified Office Format spreadsheet (.uos)
* HTML Document (OpenOffice.org Calc) (.html and .htm)
* Pocket Excel (.pxl)

[Saving presentations]
In addition to OpenDocument formats (.odp, .otp, and .odg), Impress can save in these formats:
* OpenOffice.org 1.x Presentation (.sxi)
* OpenOffice.org 1.x Presentation Template (.sti)
* Microsoft PowerPoint 2007 - 2019 (.pptx)
* Microsoft PowerPoint 97/2000/XP (.ppt)
* Microsoft PowerPoint 97/2000/XP Template (.pot)
* StarDraw, StarImpress (.sda, .sdd, and .vor)
* Unified Office Format presentation (.uop)
Impress can also export to MacroMedia Flash (.swf) and any of the graphics formats listed for Draw.

[Saving drawings]
Draw can only save in the OpenDocument Drawing formats (.odg and .otg), the OpenOffice.org 1.x formats (.sxd and .std) and StarDraw format (.sda, .sdd, and .vor).
However, Draw can also export to BMP, EMF, EPS, GIF, JPEG, MET, PBM, PCT, PGM, PNG, PPM, RAS, SVG, SVM, TIFF, WMF, and XPM.

[Saving PDF]
* Portable Document Format (.pdf)

[Word Editor/Web can save in these formats]
* HTML document (.html and .htm), as HTML 4.0 Transitional
* OpenOffice.org 1.0 HTML Template (.stw)
* OpenOffice.org 2.x HTML Template (.oth)
* StarWriter/Web 4.0 and 5.0 (.vor)
* Text (OpenOffice.org Writer/Web) (.txt)
* Text Encoded (OpenOffice.org Writer/Web) (.txt)

Trio Office is a 3rd party software that is not associated with, endorsed by or affiliated with Microsoft.