Plain-English fixes for the files Windows won't open — and the stories behind why those old formats stopped working in the first place.
A .svg is a Scalable Vector Graphics file: XML text that describes shapes instead of pixels, a W3C standard since 2001 that browsers draw natively.
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A .ico is a Windows icon file: a small directory of images at several sizes and color depths, BMP-style or PNG-compressed since Vista, and the original favicon.
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A .webp is a WebP image—Google’s RIFF-based web format from 2010, rooted in On2 VP8; lossy first, then lossless, alpha, and animation.
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Before you retire a Windows Server 2016 office file share, inventory WordPerfect, Works, Lotus, AppleWorks, and other legacy files. Copy them to a local folder first, then convert to PDF or current Office formats offline.
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A .png is a Portable Network Graphics image—lossless, chunk-based, built in 1995 to replace GIF after the Unisys LZW patent fight.
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A .gif is a Graphics Interchange Format image from CompuServe (1987)—palette-based, LZW-compressed, up to 256 colors; GIF89a added transparency and delays.
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A .bmp is a Windows Bitmap — usually an uncompressed device-independent bitmap (DIB) with a BM signature; Paint long saved them by default.
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A .jfif is a JPEG File Interchange Format image — usually the same JPEG you know as .jpg; Windows often saves downloads with that extension.
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Windows 11 and modern Word cannot open Lotus Word Pro (.lwp) files. Learn the honest options: SmartSuite compatibility mode, free office suites (Word Pro 97+), or convert .lwp locally to DOCX, PDF, Markdown, or HTML.
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A .rtf file is Microsoft’s Rich Text Format — a published, largely ASCII markup interchange for formatted documents, not Word’s native .doc/.docx binary.
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A .srw is Samsung camera RAW with sensor data and metadata — not a JPEG, not plain TIFF, not Adobe DNG, and not Sony SR2.
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A .pef is Pentax camera RAW with sensor data and metadata — not a JPEG, not braille Portable Embosser Format, and not Adobe DNG.
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A .raf is Fujifilm camera RAW with near-sensor data and an embedded JPEG preview — not a finished JPEG or Adobe DNG.
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A .rw2 is Panasonic Lumix camera RAW with sensor data and metadata — not a JPEG, not older Panasonic .raw, and not Adobe DNG.
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A .orf is Olympus RAW Format: proprietary camera RAW with sensor data and metadata — not a JPEG, and not Adobe DNG.
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Publisher left Microsoft 365 around October 1, 2026. Office 2021 / Office LTSC 2021 support ends October 13. Find your .pub files, export newer ones from perpetual Publisher to PDF, and convert older 98–2010 archives locally.
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A .arw is Sony Alpha RAW: a TIFF-based proprietary camera RAW with sensor data and metadata — not a JPEG, SRF/SR2, ARQ, or Adobe DNG.
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A .nef is Nikon Electronic Format: Nikon’s proprietary camera RAW with sensor data and metadata — not a JPEG, not NRW, and not Adobe DNG.
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A .cr2 is Canon RAW version 2: a TIFF-based camera RAW file with sensor data and metadata — not a JPEG, CR3, or Adobe DNG.
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A .dng is Adobe’s Digital Negative: an open, TIFF/EP-based camera RAW container for sensor data and metadata — not a JPEG, and not an Apple .dmg.
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An .avif is an AV1 still image in a HEIF-family container (MIME image/avif); not HEIC/HEVC, and Windows often won’t open it without a codec.
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A .sxi is an OpenOffice.org XML Impress presentation (MIME application/vnd.sun.xml.impress); PowerPoint won’t open it. Not .sdd or .odp.
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A .abw file is an AbiWord word-processor document stored as XML (AWML); Microsoft Word will not open it natively.
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A .sxc is an OpenOffice.org XML Calc spreadsheet (MIME application/vnd.sun.xml.calc); Excel won’t open it. Not .sdc or .ods.
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A .sdc is a StarCalc / StarOffice Calc binary spreadsheet (MIME application/vnd.stardivision.calc); Excel will not open it. Not .sxc or .ods.
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A .dif file is Data Interchange Format: ASCII spreadsheet interchange from Software Arts / VisiCalc. One sheet of values — not CSV or SYLK.
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A .tga file is a Truevision TARGA raster image (often 24/32-bit with optional alpha). Windows Photos often will not open it.
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A .slk file is Microsoft SYLK (Symbolic Link): ASCII spreadsheet interchange from Multiplan, later read by Excel — not a filesystem symlink.
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A .sdw is a StarWriter / StarOffice Writer binary document (MIME application/vnd.stardivision.writer); modern Word will not open it. Not .sxw or .odt.
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Convert mixed WordPerfect, Works, Ami Pro, and other legacy archive files to Markdown on this PC for a private local LLM — no ChatGPT upload.
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A .lwp is a Lotus Word Pro (SmartSuite) document; modern Word does not open it natively. Not Ami Pro .sam or WordPerfect .wpd.
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A .ppt file is Microsoft PowerPoint’s older binary presentation — often an OLE/CFB compound file from PowerPoint 97–2003, not a .pptx ZIP of XML.
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A .xls file is Microsoft Excel’s older binary workbook — often an OLE/CFB compound file with BIFF records from Excel 97–2003, not a .xlsx ZIP of XML.
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A .doc file is Microsoft Word’s older binary document — often an OLE/CFB compound file from Word 97–2003, not a .docx ZIP of XML.
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A .key file is often an Apple Keynote presentation — not a license key or Windows registry key. PowerPoint will not open it.
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Windows Photos and Explorer often will not open .avif files without the Microsoft Store AV1 Image Extension. Learn how to batch-convert AVIF to JPG or PNG offline with Legacy File Converter.
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A .pages file is an Apple Pages document from the iWork suite — Word will not open it; on Windows it may look like a folder or a ZIP.
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A .wmf is a Windows Metafile — GDI draw commands for vector clip art. Many modern apps show a blank box instead of the artwork.
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A multipage .tif/.tiff is one TIFF file with several linked Image File Directories (pages). Windows Photos often shows only the first page.
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A .jp2 file is JPEG 2000’s Part 1 image container. It uses wavelets, not classic JPG compression, and most browsers still will not open it.
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A .psd file is Adobe Photoshop’s layered document format. Windows Photos and most viewers often will not open it.
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A .dbf file is a dBASE (xBase) table with a self-describing header. Modern Excel often will not open it cleanly.
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A .hwp file is a Hancom Hangul (한/글) word-processor document from South Korea. Microsoft Word does not open it natively.
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A legacy .pub is usually a Microsoft Publisher layout from 1991 on. It is not an SSH key. Word will not open it.
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A WordStar file is a legacy MicroPro document from the early PC era. Word will not open it. It is not a Windows script, and not Windows Write.
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An .xps file is a Microsoft XML Paper Specification document — a ZIP of fixed pages. Windows 10 version 1803 stopped shipping XPS Viewer on clean installs.
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The history of HEIF and HEIC: Nokia's 2013 draft on ISOBMFF, MPEG completion in 2015, ISO print in 2017, Apple's iOS 11 High Efficiency default, and why legacy .heic photos still sit on disks in 2026.
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Samna of Atlanta shipped Ami for Windows in 1988 and Ami Professional in 1989; Lotus sold Ami Pro; IBM inherited Word Pro; legacy .sam documents and .sty style sheets still sit on disks in 2026.
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The history of Microsoft Works and .wps: Macintosh 2 October 1986, DOS 1987, Windows 1991, OEM home PCs, Works 9 in 2007, Office Starter in 2009, and legacy household files in 2026.
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Borland Quattro (1987) and Quattro Pro (1989) left .wkq, .wq1, .wq2, .wb1–.wb3, and .qpw files; Excel 2007 dropped support, and the legacy files still sit on disks in 2026.
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After you convert HEIC and old camera dumps, Photo Map pins show a thumbnail on hover. Scan a family archive by place without opening every file. Plus feature in Conversion Library Plus and Filecite — not in Standard.
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After Legacy File Converter finishes a mixed pile, Filecite lets you ask the converted archive in plain language. Answers cite the file on disk. Gather a set, then ask that set. Coming soon.
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CloudConvert, Convertio, and Zamzar convert files on their servers. For legacy WPD, HEIC, and Lotus piles, convert locally on Windows with Legacy File Converter.
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The history of WordPerfect and the .wpd file: Orem in 1979, DOS 5.1, Reveal Codes, Novell, Corel, and why those documents still sit on Windows PCs.
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Microsoft Publisher reaches end of life in October 2026. Learn how to convert .pub files to PDF on Windows, what LibreOffice can open, and how to preserve Publisher archives offline with Legacy File Converter.
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After you convert WPD, HEIC, XPS, Lotus, and the rest, the output folder is still a pile. Conversion Library Plus is your private library of those files on this PC: search, preview, map geotagged photos, and organize them. Nothing is uploaded.
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XPS files from Microsoft XPS Document Writer often will not open on modern Windows. Learn what XPS is, why viewers fail, and how to convert XPS to PDF or DOCX offline with Legacy File Converter.
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Windows Explorer shows thumbnails and a preview pane for common images but not for HEIC/HEIF, AVIF, JPEG 2000, Photoshop PSD, or Targa TGA. Legacy File Converter installs a Windows Explorer preview and thumbnail handler so those formats appear — offline, with no codec packs.
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Old backups arrive as ZIP, 7z, RAR, TAR, GZIP, BZ2, XZ, LZIP, Zstandard, or WIM archives full of legacy files. Learn how to convert the documents, spreadsheets, and images inside them — without unpacking anything by hand or modifying the original archive.
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iPhones save photos as .heic files that Windows often refuses to preview or open. Here is why it happens and how to convert HEIC to JPG or PNG offline, in bulk.
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Modern Excel dropped support for importing Lotus 1-2-3 (.wk1, .wk3, .wk4, .123) files. Learn why, and how to convert old Lotus spreadsheets to XLSX or CSV offline.
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Quattro Pro files (.qpw, .wb1, .wb2, .wb3, .wq1) barely open in any modern app. Learn how to convert Quattro Pro spreadsheets to XLSX or CSV offline with Legacy File Converter.
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Windows 11 and modern Word will not reliably open WordPerfect (.wpd) documents. Learn how to convert .wpd files to DOCX, PDF, or Markdown offline without buying WordPerfect.
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Modern Word blocks legacy .doc files for security, showing "blocked" or "unreadable content" errors. Learn how to convert old Word documents to DOCX or PDF offline.
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Microsoft Works (.wps) documents will not open in modern Word without a discontinued converter. Learn how to convert WPS files to DOCX or PDF offline with Legacy File Converter.
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Multi-page TIFF scans are awkward to view and share. Learn how to convert TIFF (.tif/.tiff) files to PDF, JPG, or PNG offline and in bulk with Legacy File Converter.
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You do not need Photoshop to open a .psd file. Learn how to convert Photoshop PSD files to JPG, PNG, or PDF offline with Legacy File Converter.
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Stop converting old files one at a time. Learn how to batch-convert entire folders of mixed legacy documents, spreadsheets, and images offline with Legacy File Converter.
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Free online file converters can expose confidential documents to third-party servers. Learn the privacy and security risks, and why local conversion is safer.
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Law firms, agencies, and archivists hold decades of records in obsolete formats. Learn a practical, private workflow to preserve legacy files as DOCX and PDF.
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Convert any legacy document or spreadsheet to universal PDF, Markdown (.md), or HTML. Learn when to use each format for archiving, the web, and AI workflows.
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Lotus Ami Pro (.sam) documents will not open in modern Word. Learn how to convert Ami Pro files to DOCX, PDF, or plain text offline with Legacy File Converter.
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Hangul (.hwp) documents are everywhere in Korea but rarely open elsewhere. Learn how to convert HWP files to DOCX or PDF offline with Legacy File Converter.
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Apple Pages (.pages) documents do not open on Windows. Learn how to convert Pages files to DOCX or PDF offline with Legacy File Converter — no Mac required.
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AppleWorks / ClarisWorks (.cwk) documents are nearly impossible to open today. Learn how to convert CWK files to DOCX or PDF offline with Legacy File Converter.
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Modern PowerPoint blocks or fails to open very old .ppt files. Learn how to convert legacy PowerPoint presentations to PPTX or PDF offline with Legacy File Converter.
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Apple Keynote (.key) presentations do not open on Windows. Learn how to convert Keynote files to PPTX or PDF offline with Legacy File Converter — no Mac needed.
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dBASE (.dbf) files store tables of data that modern Excel no longer imports cleanly. Learn how to convert DBF files to XLSX or CSV offline with Legacy File Converter.
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Apple Numbers (.numbers) spreadsheets do not open on Windows. Learn how to convert Numbers files to XLSX or CSV offline with Legacy File Converter — no Mac needed.
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Modern Excel blocks or garbles very old binary .xls workbooks. Learn how to convert legacy Excel files to XLSX, CSV, or PDF offline with Legacy File Converter.
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Windows Metafile (.wmf) and Enhanced Metafile (.emf) clip art often fails to display in modern apps. Learn how to convert WMF/EMF to PNG, JPG, or PDF offline.
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RAW camera files (CR2, NEF, ARW, and more) need special software to view. Learn how to convert RAW photos to JPG or PNG offline with Legacy File Converter.
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JPEG 2000 (.jp2) images are used in archives and medical imaging but barely supported elsewhere. Learn how to convert JP2 to JPG, PNG, or PDF offline.
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Inherited a relative’s old PC full of documents and photos in obsolete formats? Learn a simple, private workflow to convert and preserve family archives offline.
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Replacing an old Windows PC means rescuing files in formats the new machine cannot open. Learn how to convert and future-proof them offline before you retire the old PC.
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Proprietary formats become unreadable over time. Learn why PDF is the gold standard for long-term document preservation and how to convert your archives to it.
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