Identifying tool to view a *.PCB file

[ZippZapp]

I need some hints to find the correct tool to open and view a file with the extension .PCB
The file is in text format and I post the first few lines here for you to judge :

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*STATUSA
MODE Cam
DATABASE Board3a1.pcb
VERSION 3.03
DB_EXT 402590 -2998470 98078919 80063340
*END_STATUS
 
*SETTINGS
UNIT 0
RESOLUTION 10
WND_CENTER 49240754 38532435
WND_EXT 115775384 87214900
GRID1 0 0 0 
1270000 1270000 5000000 5000000
 
... etc

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Anyone who can tell me what tool has generated this file?

 

[kumarpcb]

It might have been a protel or accel design software