C2t

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File Format
Name C2t
Ontology
Extension(s) .com
Released 2000

c2t is collection of two DOS utilities, c2t1 and c2t2, developed by Jørgen Ibsen (a.k.a. Jibz). Each converts a COM file to one whose bytes all belong to a certain set of ASCII characters, and which still has the same functionality. c2t1 has a smaller decoder, while c2t2 usually produces smaller files.

See Executable envelopes#Transfer-encoded executables for some similar utilities.

Identification

c2t1-encoded files always start with the same 58 bytes, which can be found in the source code. The first 16 are ASCII "X502503P_5:S)E8,".

c2t2-encoded files always start with the same 112 bytes, which can be found in the source code. The first 16 are ASCII "X502503P_5:P)En-".

Software

  • c2t.zip - DOS binaries + assembly language source code
  • GitHub project - Includes a utility to recover the original file.
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