#define MyAppName "My Program"
#define MyAppExeName "MyProg.exe"

[Setup]
AppName={#MyAppName}
AppVersion=1.5
DefaultDirName={pf}\{#MyAppName}
ChangesAssociations=yes
OutputDir=userdocs:Inno Setup Examples Output

[Files]
Source: "MyProg.exe"; DestDir: "{app}"

[Registry]
Root: HKCR; Subkey: ".wcalc"; ValueType: string; ValueName: ""; ValueData: "{#MyAppName}"; Flags: uninsdeletevalue
Root: HKCR; Subkey: "{#MyAppName}"; ValueType: string; ValueName: ""; ValueData: "BHKW-Calc Datei"; Flags: uninsdeletekey
Root: HKCR; Subkey: "{#MyAppName}\DefaultIcon"; ValueType: string; ValueName: ""; ValueData: "{app}\icon.ico,0"
Root: HKCR; Subkey: "{#MyAppName}\shell\open\command"; ValueType: string; ValueName: ""; ValueData: """{app}\{#MyAppExeName}"" ""%1"""