MRNZ
From Just Solve the File Format Problem
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== Identification == | == Identification == | ||
− | Files start with ASCII "{{magic|MRNZ}}", apparently always followed by {{magic|0x88 0xf0 0x27 0x33 0x26}}. | + | Files start with ASCII "{{magic|MRNZ}}", apparently always followed by {{magic|0x88 0xf0 0x27 0x33}}. The next four bytes always seem to be {{magic|0x26 0x00 0x00 0x00}}, but if this is the number of obfuscated bytes, it might be different for very small files. |
+ | |||
+ | == Software == | ||
+ | * {{Deark}} | ||
== Sample files == | == Sample files == | ||
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* [https://archive.org/details/Shareware_Overload_Trio_Volume_2_Chestnut_CD-ROM Shareware Overload Trio Volume 2] → DIR41/USD631.*, ... | * [https://archive.org/details/Shareware_Overload_Trio_Volume_2_Chestnut_CD-ROM Shareware Overload Trio Volume 2] → DIR41/USD631.*, ... | ||
* [https://archive.org/details/os2_94 IBM Presents OS/2 Software Hits - First Edition 1994] → os2_94/I20/{FRD631.*, ..., GRD631.*, ...} | * [https://archive.org/details/os2_94 IBM Presents OS/2 Software Hits - First Edition 1994] → os2_94/I20/{FRD631.*, ..., GRD631.*, ...} | ||
+ | * {{DexvertSamples|archive/mrnz}} | ||
[[Category:Obfuscation]] | [[Category:Obfuscation]] | ||
[[Category:IBM]] | [[Category:IBM]] |
Latest revision as of 19:24, 19 September 2024
MRNZ (for lack of a better name) is a simple installer-archive format. It is a lightly obfuscated non-compressed single-file format. Its only known use is in certain distributions of IBM PC DOS 6.3, where it seems to be a companion to KWAJ format.
Contents |
[edit] Format details
A file seems to be decoded as follows: Skip the first 12 bytes, xor the next 38 bytes with 0xAE, and copy the rest of the file unchanged.
[edit] Identification
Files start with ASCII "MRNZ
", apparently always followed by 0x88 0xf0 0x27 0x33
. The next four bytes always seem to be 0x26 0x00 0x00 0x00
, but if this is the number of obfuscated bytes, it might be different for very small files.
[edit] Software
[edit] Sample files
(Files here are likely in LoadDskF/SaveDskF disk images.)
- Shareware Overload Trio Volume 2 → DIR41/USD631.*, ...
- IBM Presents OS/2 Software Hits - First Edition 1994 → os2_94/I20/{FRD631.*, ..., GRD631.*, ...}
- dexvert samples — archive/mrnz