I cannot find the right program to open these files with. I was told that Cadence or MatrixOne could open these but I've had no success with that. These are believed to be blueprints for circuitboards. These are the extensions that are grouped together: .tag .cdb .cat .db .drf .xx .txt Any help would be appreciated. Thanks.

Some thoughts: .txt is a text document. Any word processor or text editor will be able to read this, so have a look at them and see if they give you any clues! .drf is used by a number of relatively obscure graphics programs. Photoline is about the best known of these, and can be had as a timelimited free download. You may need to buy the product before you can do much with the files, but the free version should at least enable you to see if this is what they are! .xx may be a clue. I'm only aware of two applications which used this extension. One of them is Arcedit, which was intended for mapmaking - therefore I can see that it just might have been used for designing circuit boards. Unfortunately, it's practically dead and could be difficult to find. (I encountered it at university more than ten years ago, but have not come across it since - and I know a number of mapmakers!) The other use of .xx was in XXencoded, which was a file encoding utility (not much used now). Winzip can open XXencoded files, so try that first, if only to eliminate it! The others you list all occur in a number of applications. .cdb, .cat and .db are used in various database programs, and you would have to guess as to which. Pocket Access uses .cdb and that may be the easiest thing to try first. Of course I could be totally wrong, and they could all relate to some package I haven't come across!

Perhaps this site could shed some light on the subject. http://whatis.techtarget.com/fileFormatA/0,289933,sid9,00.html Where's that any key?

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