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Com2txt - Just Solve the File Format Problem

Com2txt

From Just Solve the File Format Problem
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File Format
Name Com2txt
Ontology
Extension(s) .com
Released ≤1993

Com2txt is a utility that converts a DOS COM file to one whose bytes all belong to a certain set of ASCII characters, and which still has the same functionality. It was developed by Naoyuki Nide. Most of the information about it is in Japanese.

It's a silly hack, but it had some practical uses, such as for embedding a COM file in a Batch file, email, etc.

It has a -r option, to recover the original file.

Contents

Disambiguation

Not to be confused with Com2txt (Dark Stalker).

For other software with a similar name or function, see Executable envelopes#Transfer-encoded executables.

Identification

Only version 1.11 has been evaluated. It can decode three formats, which we'll call old, new-default, and new-alternate.

Old files (e.g. from v1.00) start with "TXPPP".

New-default files (e.g. from v1.11) start with a roughly 200-byte prefix that begins "T_OOWW3=XXWX" (see the HDR_DATA.C source file). The signature "com2txt/Nide" also appears in the standard prefix, but is less reliable for format identification.

New-alternate format is enabled with the -c option (undocumented in English). It is named something like "com-batch shared format". The format begins ":=%00%AA5$QP".

GetTyp reports the existence of several newer versions of Com2txt, through v1.41. According to its database, files from v1.20-1.41 start the same way as v1.03-1.12, with "T_OOWW3=XXWX", but then they diverge.

Software

Sample files

  • xpa167m.zip → *.COM (files have a customized signature)
Personal tools
Namespaces

Variants
Actions
Navigation
Toolbox

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