Extract text from UNKNOWN files
To convert your UNKNOWN file to another format, you need VLC media player or other Other software.
To convert other file formats to the "Generic / Missing Extension" file type, you need software like VLC media player or a similar tool.
A .UNKNOWN file is a generic system label applied when a file's original extension is missing, corrupted, or stripped, preventing the operating system from associating it with a specific application. This often occurs with email attachments (e.g., ATT00001.unknown), data recovery fragments, or mobile messaging downloads (like WhatsApp audio). Internally, the file is typically a standard, valid format that has simply lost its name tag; statistical analysis shows that over 50% of these files are actually MP4 videos, MHTML web archives, or PDF documents.
The primary difficulty is the inability to double-click and open the file, leaving users to guess the format or use trial-and-error renaming. Attempting to open these in a text editor often results in unreadable binary code. Instead of guessing, the most efficient workflow is to use a conversion tool that inspects the file header (magic numbers) to identify the true type. If you suspect it is a video, identifying and converting it to MP4 ensures playback on any device. For text or binary data that might be a document, converting to PDF is the safest bet for archiving and viewing. Tools like VLC media player are also robust enough to play media files even if the .UNKNOWN extension is incorrect.
Convert.Guru analyzes your UNKNOWN file, detects the exact format, and lets you read the text inside.
Users also converted DAT, BIN, VLC, FILE_PHOTO, UNK, AUDIO, PDF, WIZIN, VOICE, JPG, WMP, DAC and ZIP files.
If you want to convert UNKNOWN file to MP3, PDF, JPG, MP4, WAV, TMP, TEMP, CACHE, LOG, BAK, OLD or NEW, you can use VLC media player or similar software from the "Unidentified File Placeholder" category. In the File menu, look for Save As… or Export….
To convert DEVICE, CACHE, SOCK, SYMLINK, PID, MOUNT, FIFO, LOG, PIPE, TMP, JUNCTION or TEMP files to UNKNOWN, try VLC media player or another comparable tool in the "Unidentified File Placeholder" 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 UNKNOWN converter.