FileAlyzer

FileAlyzer is the perfect application for analyzing the content of any file, although it's most useful for executable files.

This program gives you more information than Windows' file properties window, including the MD5, the CRC-32, and the file's hex dump.

If you analyze an executable file, you'll be able to see all the files it contains. FileAlyzer can also process zip files, database files, multimedia files, and ID3 tags.

Also, FileAlyzer easily integrates into Windows' context menu. Just click on the 'Analyze file with FileAlyze' option to use the program.

One last thing: some executables come packed in compression format called UPX. You'll need a special decompressor to be able to access that content.