this is the extract from the link Vladimir posted

Avoiding Duplicate Registry Keys

For every application that uses DirectInput 8.0 or later versions, DirectInput creates a key in the following registry.

HKEY_CURRENT_USER
SOFTWARE
Microsoft
DirectInput

This allows the independent hardware vendors (IHVs) to turn off their own device mapping for certain applications. During debugging, however, each build will generate a new key which contains a time stamp and the file size. To avoid generating multiple keys in the registry, use the binary value, AppldFlag.

The following table lists the possible values for AppldFlag.
1 The time stamp is ignored when generating the key.
2 The file size is ignored when generating the key.
3 Both the time stamp and file size are ignored when generating the key.

If AppldFlag is set to 3, all builds of applications with the same file name will use the same key.
Note The AppldFlag value should only be set on test computers to avoid the possibility of two applications that ship with the same file name interfering with each other's input control mappings.
Force Editor

Force Editor has the following characteristics.
Description

The Force Editor application enables you to design force-feedback effects and test them singly or in combination. Effects can be saved to file and then loaded into DirectInput applications.
Path

Executable: (SDK root)BinDxutilsFedit.exe
User's Guide

The Force Editor has its own documentation. When you've launched Fedit.exe, press F1 for online Help. The Help file can also be launched directly.

It's up to you, I didn't find any italian reference so I cannot give further infos