pfs:Write
From Just Solve the File Format Problem
pfs:Write was a simple word processor created by Software Publishing Corporation (SPC) in the early days of desktop computing. It was intended for DOS systems, but Apple II versions were also released.
The last version, Professional Write 3.0 for DOS, was released in 1994. Professional Write Plus was developed for Windows 3.x in 1991.
File identification
First 4 bytes are hex values 42 00 06 00
or 42 00 0C 00
and have an EOF byte of 0E