FXPF
From Just Solve the File Format Problem
FXPF is the signature of what is presumably a Microsoft binary patch file format. It was used in some MS-DOS 6.x upgrade ("Step-Up") packages.
Identifiers
The last character of the original filename extension is replaced by an uncommon character such as "#", "^", or "@".
Identification
Files begin with ASCII "FXPF", possibly always followed by bytes 0x00 0x00.
Sample files
- DOS62.ZIP - MS-DOS 6.2 Step-Up
- 622_STEP.ARJ - MS-DOS 6.22 Step-Up
