Question: I need to install a couple of installers in the same directory so it conflicts with the Inno Setup uninstaller name `unins000.exe` and `unins000.dat`

Is there a way to change the default name of an Inno Setup uninstaller?

Answer: 
This is similar to Elektrostudios' answer, and is what worked for me:

```
    Filename: {cmd}; Parameters: "/C Mkdir ""{app}\Uninstallers\{#MyAppName}"""; Flags: RunHidden WaitUntilTerminated
    Filename: {cmd}; Parameters: "/C Move ""{app}\unins000.exe"" ""{app}\Uninstallers\{#MyAppName} - uninstall.exe"""; StatusMsg: Installing {#MyAppName}...; Flags: RunHidden WaitUntilTerminated
    Filename: {cmd}; Parameters: "/C Move ""{app}\unins000.dat"" ""{app}\Uninstallers\{#MyAppName} - uninstall.dat"""; StatusMsg: Installing {#MyAppName}...; Flags: RunHidden WaitUntilTerminated
    Filename: {cmd}; Parameters: "/C Move ""{app}\unins000.msg"" ""{app}\Uninstallers\{#MyAppName} - uninstall.msg"""; StatusMsg: Installing {#MyAppName}...; Flags: RunHidden WaitUntilTerminated
    Filename: REG.exe; Parameters: "ADD ""HKLM\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Uninstall\Windows 8 ContextMenu - {#MyAppName}_is1"" /V ""UninstallString"" /T ""REG_SZ"" /D ""\""{app}\Uninstallers\{#MyAppName} - uninstall.exe\"""" /F"; StatusMsg: Installing {#MyAppName}...; Flags: RunHidden WaitUntilTerminated
    Filename: REG.exe; Parameters: "ADD ""HKLM\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Uninstall\Windows 8 ContextMenu - {#MyAppName}_is1"" /V ""QuietUninstallString"" /T ""REG_SZ"" /D ""\""{app}\Uninstallers\{#MyAppName} - uninstall.exe\"" /SILENT"" /F"; StatusMsg: Installing {#MyAppName}...; Flags: RunHidden WaitUntilTerminated

```

Using Windows 7, I discovered that the "Move" command wouldn't work unless I had somewhere to move the files to first, meaning that I had to add the mkdir line at the top. Also, the uninstaller wouldn't work without the .msg file moved as well, so I followed the pattern and added that line too.

I didn't bother to change "Windows 8" to "Windows 7" but it didn't make any difference, so I'm leaving it alone. If there's a problem with that I'm unaware of, I'm sure someone will indicate such in a comment.

{#MyAppName} is, of course, the constant defined at the top of the ISS file declaring the name of the application. Your constant may be defined differently, so you'll need to change it to match where necessary.
No. 'unins' is hard-coded in the name generation procedure of the executable, data and msg files, in `GenerateUninstallInfoFilename`' procedure in 'install.pas' of inno-setup sources.

`GenerateFilenames` sub procedure has this:

```
BaseFilename := AddBackslash(BaseDir) + Format('unins%.3d', [I]);
UninstallExeFilename := BaseFilename + '.exe';
..

```

Where 'I' is an integer and 'BaseDir' is derived from `UninstallFilesDir` which you can change.