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Article #12129

Re: Mysterious EXE compressor: MZ

#12129
From: LIM O
Date: Fri, 15 May 1992 12:30
29 lines
2211 bytes
In <1992May14.190913.352@IRO.UMontreal.CA> jalbert@IRO.UMontreal.CA (Francois Jalbert) writes:

>Dear fellow DOS users,

>I am about to release my fourth freeware package to SIMTEL, and I'd like some 
>information about run-time EXE compressors.

>In the past, I have avoided using PK-Lite since this is not a freeware program 
>and I didn't know if I could use it in my freeware releases without being 
>morally bound to register it. 

>This is why I prefer the freeware LZEXE 0.91, which is just as good.

>However, I came yesterday across another EXE compressed with some mysterious 
>MZ program. That is, the first bytes of the compressed EXE are MZ, with 
>nothing else to help identify the compressor used. This is not the first time 
>by far that I encounter such EXE files and I decided this time to look into it 
>some more. 

MZ is the first two bytes of every EXE file (that works!).  It stands for the
initials of one of the designers of MS-DOS I forget his name.  

The program is probably something else.  I only have one other run-time compres-sor and that is something called Diet.  It also does runtime compressing of     other files but that is an option.  the compression rate is _very_ bad, even 
worse than say, PK-Lite.  it uses a method called Adaptive LZW.  I don't use
it but from what i hear it's not bad.

Hope that Helps,

Tihor.
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References: <9213510.16276@mulga.cs.mu.OZ.AU> <_4zv78m@rpi.edu> <1992May14.190913.352@IRO.UMontreal.CA>

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From: h8ed013@stan.xx.swin.oz.au (LIM O)
Newsgroups: comp.sys.ibm.pc.misc,aus.computers.ibm-pc
Subject: Re: Mysterious EXE compressor: MZ
Message-ID: <6485@stan.xx.swin.oz.au>
Date: 15 May 92 12:30:35 GMT
References: <9213510.16276@mulga.cs.mu.OZ.AU> <_4zv78m@rpi.edu> <1992May14.190913.352@IRO.UMontreal.CA>
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Distribution: aus
Organization: Computer Centre, Swinburne Inst. of Tech., Melbourne, Australia.
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