Using GetTempFileName, we can create a unique name for temporary file. It’s useful when your application is using temporary files and you want to save them into default TEMP folder and use a “random” filename.

To get full path to application associated with any file type, we need standard ShellAPI unit and the rest will do the FindExecutable function.

To search for a specific substring within any type of file, we can use this rather complex function.

One of the most effective method to check if the file is ok is to calculate CRC32 checksum and compare it with previously saved value. Using CRC check, you can also compare two files, verify downloaded files etc…

Using ShellAPI unit and few lines of code, we can load directory structure into ListView and show associated icons and information for each file.