title: how to start multiple files in windows in one process?
body: <p>I have a java audio player with a exe launcher which I made with launch4j and created a installer with inno setup. In windows when I select multiple files and open them, each file opens in different process, but what I want is all the files to open in one process.</p>
  <p>In inno setup-</p>
  <pre><code>Root: HKA; Subkey: &quot;Software\Classes\.mp3\OpenWithProgids&quot;; ValueType: string; ValueName: &quot;{#MyAppAssocKeyMP3}&quot;; ValueData: &quot;&quot;; Flags: uninsdeletevalue
  Root: HKA; Subkey: &quot;Software\Classes\{#MyAppAssocKeyMP3}&quot;; ValueType: string; ValueName: &quot;&quot;; ValueData: &quot;{#MyAppAssocName}&quot;; Flags: uninsdeletekey
  Root: HKA; Subkey: &quot;Software\Classes\{#MyAppAssocKeyMP3}\DefaultIcon&quot;; ValueType: string; ValueName: &quot;&quot;; ValueData: &quot;{app}\{#MyAppExeName},0&quot;
  Root: HKA; Subkey: &quot;Software\Classes\{#MyAppAssocKeyMP3}\shell\open&quot;; ValueType: string; ValueName: &quot;MultiSelectModel&quot;; ValueData: &quot;&quot;
  Root: HKA; Subkey: &quot;Software\Classes\{#MyAppAssocKeyMP3}\shell\open\command&quot;; ValueType: string; ValueName: &quot;&quot;; ValueData: &quot;&quot;&quot;{app}\{#MyAppExeName}&quot;&quot; &quot;&quot;%1&quot;&quot;&quot;
  </code></pre>
  <p>Do I have to change the open command in inno setup? If yes, what is the right command?</p>
  <p>Thanks.</p>