As posted in the file description, you must have .Net framework installed:
http://www.eq2interface.com/download...fo.php?id=3509
Before Installing:
You must have The Microsoft .Net Framework 1.1 or greater for this program to run
The Microsoft .Net Framework 1.1 can be downloaded either from this
direct download link or if you prefer you can get it from
windows update. When you try and run the program and you get "The application failed to initialize properly (0xc0000135). Click on OK to terminate the application." or something similar it is because you either dont have the .net framework, or you have the .net framework but it not 1.1 or greater.
Microsoft .NET Framework 2.0 BETA is required if you are running x64 edition of Windows XP (you need the x64 version)