OpenOffice uses ISO/IEC 26300:2006 OpenDocument as its native format. Versions 2.0–2.3.0 of OpenOffice default to the ODF 1.0 file format; OpenOffice versions 2.3.1–2.4.3 default to ODF 1.1.
Up to 1.x, OpenOffice used OpenOffice.org XML. This was contributed to OASIS and OpenDocument was developed from it.
OpenOffice also claims support for the following formats:
Format
Extension
Reading
Writing
Notes
OpenOffice.org XML
SXW, STW, SXC, STC, SXI, STI, SXD, STD, SXM
Yes
Yes
native up to 1.x
Microsoft Word for Windows 2
DOC, DOT
Yes
Yes
Microsoft Word 6.0/95
DOC, DOT
Yes
Yes
Microsoft Word 97-2003
DOC, DOT
Yes
Yes
Microsoft Word 2003 XML (WordprocessingML)
XML
Yes
Yes
Microsoft Excel 4/5/95
XLS, XLW, XLT
Yes
Yes
Microsoft Excel 97-2003
XLS, XLW, XLT
Yes
Yes
DocBook
XML
Yes
Yes
since 1.1
WordPerfect
WPD
Yes
WordPerfect Suite 2000/Office 1.0
WPS
Yes
StarOffice StarWriter 3/4/5
SDW, SGL, VOR
Yes
Yes
Ichitaro 8/9/10/11
JTD, JTT
Yes
ApportisDoc (Palm)
PDB
Yes
Yes
Requires Java
Hangul WP 97
HWP
Yes
Microsoft Pocket Word
PSW
Yes
Yes
Requires Java
Microsoft Pocket Excel
PXL
Yes
Yes
Requires Java
Microsoft RTF
RTF
Yes
Yes
"you are likely to experience loss of formatting and images"
Plain text
TXT
Yes
Yes
various encodings supported
Portable Document Format
PDF
Yes
Yes
Export from 1.1; PDF/A-1a (ISO 19005-1) export from 2.4; some readable in Impress
Comma-separated values
CSV, TXT
Yes
Yes
Microsoft Excel 2003 XML
XML
Yes
Yes
Lotus 1-2-3
WK1, WKS, 123
Yes
Data Interchange Format
DIF
Yes
Yes
StarOffice StarCalc 3/4/5
SDC, VOR
Yes
Yes
dBase
DBF
Yes
Yes
SYLK
SLK
Yes
Yes
HTML
HTML, HTM
Yes
Yes
Quattro Pro 6.0
WB2
Yes
Microsoft PowerPoint 97-2003
PPT, PPS, POT
Yes
Yes
StarOffice StarDraw/StarImpress
SDA, SDD, SDP, VOR
Yes
Yes
Computer Graphics Metafile
CGM
Yes
Binary-encoded only; not those using clear-text or character based encoding
StarOffice StarMath
SXM
Yes
Yes
MathML
MML
Yes
BMP file format
BMP
Yes
Yes
JPEG
JPG, JPEG
Yes
Yes
PCX
PCX
Yes
PhotoShop
PSD
Yes
SGV
SGV
Yes
Windows Metafile
WMF
Yes
Yes
AutoCAD DXF
DXF
Yes
MET
MET
Yes
Yes
Netpbm format
PGM, PBM, PPM
Yes
Yes
SunOS Raster
RAS
Yes
Yes
SVM
SVM
Yes
Yes
X BitMap
XBM
Yes
Enhanced Metafile
EMF
Yes
Yes
HPGL plotting file
PLT
Yes
SDA
SDA
Yes
Truevision TGA (Targa)
TGA
Yes
X PixMap
XPM
Yes
Yes
Encapsulated PostScript
EPS
Yes
Yes
PCD
PCD
Yes
Portable Network Graphic
PNG
Yes
Yes
SDD
SDD
Yes
Tagged Image File Format
TIF, TIFF
Yes
Yes
Graphics Interchange Format
GIF
Yes
Yes
PCT
PCT
Yes
Yes
SGF
SGF
Yes
Adobe Flash
SWF
Yes
Export from Impress
Scalable Vector Graphics
SVG
Yes
Export from Draw
Software602 (T602)
602, TXT
Yes
Unified Office Format
UOF, UOT, UOS, UOP
Yes
Yes
since 3.0