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In this case, there's very little you can do through the program to solve your problems. If you are less lucky, though, you might lose a password to something like a zip file. All it will take is a quick email and the answers to some security questions for you to get access to your data. If you are very lucky, you'll lose it for a web-based product that will allow you to recover that password. You can select from predefined character sets or define a custom charset (this is what you want), as also select the word to start from, password mask, password length etc.Ultimate Zip Cracker is a program that helps users discover zip file passwords on Windows PCs.
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There are many password recovery programs available (both free and paid) that allow you to specify a custom list of characters to be used for brute-force attacks, Advanced Archive Password Recovery being just one of them (albeit one I have used successfully):
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