Winmaildat Opener vs OOReader Usage & Stats
Winmail.dat Opener is a free app to open those common 'winmail.dat' attachments. This app is free of charge and fully functional, giving you access to the files without any need for further in-app purchases. The optional in-app-purchase will remove ads.
Our app registers as a handler for .dat files. It is launched when you tap to open the "winmail.dat" attachment, enabling you to see a list of its contents. You can then preview, resend or print the contained files or save them to an album.
This app will extract the winmail.dat on your phone or tablet, it does not require an Internet connection for this process. As our app is ad-supported, it has to ask for permission to access the Internet, despite the fact that the actual extraction process does not require an Internet connection.
Kindly note that not every file ending with .dat is a winmail.dat file. So, before submitting a one star review stating that our service didn’t work, please ensure that your file is indeed a winmail.dat file and not one of a hundred different file types with a .dat extension.
- Apple App Store
- Free
- Utilities
Store Rank
- -
OOReader is the essential mobile viewer for all your office documents. Easily open and view files created with OpenOffice and LibreOffice (Writer, Calc, Impress), common Microsoft Office formats (Word, PowerPoint, Excel), PDFs, and many other documents.
Instantly access all your critical information, regardless of the file type:
OpenOffice / LibreOffice (ODF Standard):
• Writer: ODT, OTT, STW, SXW
• Calc: ODS, OTS, STC, SXC
• Impress: ODP, OTP, SDD, SDP
• Draw & Math: ODG, OTG, STD, SXD, ODF, ODC, SXM, MML
Microsoft Office:
• Word: DOC, DOT, DOCX, DOTX, DOCM
• Excel: XLS, XLT, XLSX, XLTX, XLSM
• PowerPoint: PPS, PPT, POT, PPSX, PPTX, POTX
• Visio: VDX, VSD, VSDX
Other Formats:
• PDF (Adobe Portable Document Format)
• RTF (Rich Text Format, WordPad)
• Legacy: WordPerfect, Lotus 1-2-3, QuattroPro, WordPro, QuarkXPress
Key Features:
• Quick PDF Conversion: Easily convert any supported document into a standard PDF file for reliable sharing or archival.
• Sharing & Printing: Instantly share the converted PDF via email or to other apps, or print the document directly.
• Optimal Viewing: Seamless page-by-page or slide-by-slide reading modes.
• Essential Tools: Use the built-in search function to find specific text within long documents.
• Advanced Features (PRO Upgrade):
◦ Open documents with password protection.
◦ View documents with unlimited pages (removes the 100-page limit).
Important Notes:
• OOReader is a document viewer only. File content cannot be edited or modified.
• To perform document conversion for accurate viewing, OOReader utilizes an online service. An Internet connection is required for this conversion process.
- Apple App Store
- Free
- Utilities
Store Rank
- -
Winmaildat Opener VS. 
OOReaderJanuary 11, 2026