c# - decompressing compressed binary file -

i have compressed file (binary file/compressed string - i'm not sure is),
i'am trying decompress file c#/vb.net ,
tried decompress gzip:

 private shared function gzuncompress(byval data() byte) byte()         dim input memorystream = new memorystream(data)         dim gzip gzipstream = new gzipstream(input, compressionmode.decompress)         dim output memorystream = new memorystream         gzip.copyto(output)         return output.toarray     end function 

gzuncompress(new system.net.webclient().downloaddata("http://haxball.com/list3")) 

there exception (where : gzip.copyto(output)):

the magic number in gzip header not correct 

when tried uncompress php it's worked :) .

php header('content-type: text/html; charset=utf-8');  $list = file_get_contents('http://haxball.com/list3');  $list = gzuncompress($list);  $len = implode('', unpack('n*', $list));  $bytes = unpack('c*', $list);  $string = implode('', array_map('chr', $bytes));  echo $string; 

can check code here:
http://www.compileonline.com/execute_php_online.php
have php's gzuncompress c#/vb.net alternative?

even if there extarnal exe file can same php's gzuncompress function answer,

kind of:

process.start("c:\umcompress.exe -f c:\list3 -o c:\res.txt") 

note:a example better explanation

update: first 30 bytes of file:

78 da 8c bd 79 f4 5d d7 55 26 78 65 0d f1 24 0f 89 e3 98 4c 5c 47 21 71 e2 c8 b9 e7 9e e1 

that zlib stream. zlib format described in rfc 1950, , consists of two-byte header , four-byte trailer around deflate stream. need write own code process header , trailer, , can use deflatestream class decompress deflate stream.

or can use dotnetzip process zlib stream directly.