What Is a .WS File? WordStar Documents on Modern Windows
The file that defined PC word processing, and why it looks like garbage in Notepad.
TL;DR
A .WS file is a WordStar document from MicroPro / WordStar International. Classic files use high-bit wrap flags, print controls `00h–1Fh`, extended characters `1Bh xx 1Ch`, Release 5+ symmetrical sequences, dot commands, and EOF `1Ah`. Microsoft Word has no import filter. LibreOffice’s filter is incomplete. Convert locally with WordStar Converter.
Where .WS files come from
WordStar was the default serious word processor on CP/M and early IBM PCs. Writers, law offices, and government shops produced millions of documents in it. Later releases added `.wsd` and versioned extensions such as `.ws3` through `.ws8`. They are the same family.
The product line is not Ami Pro, Samna, or Lotus Word Pro. Those are different formats. If the file starts with high-bit text and print-control bytes rather than a `[ver]` Ami header, you are looking at WordStar.
Why it looks broken in Notepad
WordStar did not store a space-separated paragraph the way Word does. The last character of a wrapped word often has bit 7 set. That flag means “soft wrap,” not “this is character 0xC1.” Notepad treats the high bit as Latin-1, so you see accented junk instead of a line break.
Print controls (`^B` bold, `^S` underline, and the rest of `00h–1Fh`) sit in the stream. Dot commands such as `.pl 66` and `.he Letterhead` sit on their own lines. A converter that does not unwrap and interpret those two layers produces a transcript, not a document.
What actually opens them in 2026
Windows 10 and 11 have no viewer. Word has no WordStar filter. LibreOffice ships a limited WordStar import that often mangles wrap flags and 5.0+ sequences. A DOS VM with original WordStar still works for five files and does not scale to five thousand.
The practical path is a native parser on this PC: unwrap, map controls, honor dot commands, write DOCX or PDF. Nothing is uploaded.
Related reading
Open the .WS files on this PC
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