Extract text from Readiris dictionaries (DUS)
To convert DUS dictionaries to another format, you need Readiris or other Data software.
To convert other file formats to the "Application Dictionary File" file type, you need software like Readiris or a similar tool.
.DUS files are proprietary dictionary files utilized by Readiris, a popular Optical Character Recognition (OCR) software developed by I.R.I.S.. These files store user-defined vocabularies and font training data, which the software uses to improve text recognition accuracy when scanning complex or specialized documents.
The primary disadvantage of the .DUS format is its heavily proprietary and undocumented nature. It is exclusively locked to the Readiris ecosystem. Users cannot naturally share their highly trained custom dictionary data with other major OCR engines like Tesseract or ABBYY FineReader. This creates a frustrating vendor lock-in, making it difficult to migrate systems or back up vocabularies in an open, future-proof format.
Ideally, users want to convert .DUS files to plain TXT or CSV formats to export the word lists for use elsewhere. However, this is a closed database format. Standard online converters fail to process it because they lack the specific parsing logic required to extract the vocabulary without corrupting the data. Often, only the original Readiris software can properly read or export the structured data.
Despite this, convert.guru offers a practical workaround. Just drag and drop your file to identify the format, view it, and convert it when possible. Our system can inspect the raw file to extract plain text strings and internal content, allowing you to salvage custom vocabularies even if you no longer have an active Readiris license.
Convert.Guru analyzes your DUS file, detects the exact format, and lets you read the text inside.
Users also converted YTR and QDI files.
If you want to convert DUS file to TXT, RTF, DOC, DOCX, ODT, PAGES, TEX, LATEX, MD, MARKDOWN, LOG or NFO, you can use Readiris or similar software from the "OCR Dictionary Storage" category. In the File menu, look for Save As… or Export….
To convert PDF, DOC, ASC, TODO, NFO, MEMO, README, DOCX, JPG, TXT, NOTE or RTF files to DUS, try Readiris or another comparable tool in the "OCR Dictionary Storage" category.
The history of Convert.Guru began over 25 years ago in California with Tom Simondi’s file-format database. A former contributor to Space Shuttle development and a software pioneer of the 1980s, Simondi established a trusted resource for file type analysis that was even referenced by Microsoft Windows XP. Today, we use modern technology to process and convert thousands of file formats while continually improving our DUS converter.