Encrypting a single file is very easy. First locate the file you wish to encrypt and "Right Click" it. Then choose "128Gamma Encryption" from the "Context Menu".
A dialog will appear asking for a password, Simply enter a password and click OK.
These are the same steps to follow to Encrypt or Decrypt single files using 128Gamma.
Windows Context Menu
Above is the windows context menu, It contains common commands & shortcuts. It pops up when you right click on a file.
NOTE: Your context menu may slightly differ from the above image.