A hash is just a string that has been computed with the use of an algorithm. That hash is always the same as long as the file that has been checked is not modified. This leads directly to many uses of hash values. They can be used to check that a file is still the same on one computer, that a file that has been uploaded to a remote computer is the same as the file on the source computer or that a download from an Internet website is not corrupt.

Hash Tab is a Windows shell extension that adds a tab in the File Properties window that is displaying has values of various algorithms like MD5, CRC32 or SHA-512.

One interesting feature of Hash Tab is the ability to compare hashes in the File Properties dialog. It is possible to select a second file on the hard drive and compare it with the first one or to paste a hash into one of the forms and compare the files that way. The second option is obviously thought for comparing files that are not located on the same computer. Helpful after downloading files on the Internet or transferring files to a remote computer.

Hash Tab is only one review that was posted by Demetris at his blog. He lists Fifteen useful shell extensions for Windows with lots of screenshots and information on his website.

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