File extension help

[vinifera]

hello

I need a help from... well those who are good in these kind of things

I have bunch of .RSF files

they are taken out of old Microsoft Windows Longhorn system files (extracted resource)

my thinking is that they are some sort of images, this will tell you why:

problem is renaming them to PNG does nothing

also by googling (specificaly for MS OS - Longhorn) I only came acros 1 article

saying those were mislabeled RSS files, but as you see from picture

it looks nothing like RSS, in fact they have nothing incomonn with XML

or they are encrypted ?

heres link to 1 file for analysis

http://www.mediafire.com/?rayi4vrmc3rp1p1

anyone have idea how to "convert" them to image or extract it out ?

or what the heck they might be ?

Edited February 2, 2011 by vinifera

[allen2]

It seems a lot like a PNG file as it the same structure IHDR gAMA cHRM IDAT IEND but after IHDR it miss the sRGB part so it might be non a standard png.

Edited February 2, 2011 by allen2

[jaclaz]

Well, you cannot just rename them to .png.

The 89 50 4E 47 0D 0A 1A 0A in the header is first 8 bytes, you have an "excess header" of 24 bytes:

http://en.wikipedia.org/wiki/Portable_Network_Graphics#File_header

You need at least to cut it out.

jaclaz

Edited February 2, 2011 by jaclaz

[vinifera]

ah nice

cutting did the job

thanks guys