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Is that the same commercial program you wanted to alter in a different thread? The one that got closed because we will not help you with cracking commercial software?
I would guess that file is encrypted for a reason and if you want to decrypt it contact the developers for help.
Also (and here I am either assuming, for simplicity, that his request is "innocent," or that there will be others in the future that are, and so I am addressing them) ... here are a few general tricks that you can use with "unknown files."
The file command tests a series of "magic keys" to try to identify what sort of file a file is. It might not help too much with this one.
Sometimes, a confusing-looking file just uses a particular encoding, perhaps with-or-without encryption. For example, this file might be base64-encoded, no matter what its content is. (Crypted files are routinely encoded that way, but not all files encoded that way are encrypted.)
Files from external sources can use different character-sets. For example, IBM mainframe machines still often use EBCDIC. Knowing anything about the source of a file can help in developing a plan to properly deal with it.
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