stilview: command not found

Have You tried accessing the binary with the full path?

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH

If it's empty, You may set the PATH variable with this command

export PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin"

On Debian possible default full paths are:

/usr/bin/stilview - from package: sidplayfp

You may install the required package with command apt-get install {package}
Error in other languages:
stilview: bevel nie gevind nie
stilview: comandă negăsită
stilview: comando não encontrado
stilview: commande introuvable
stilview: command not found
stilview: käsku ei ole
stilview: không tìm thấy lệnh
stilview: komanda nerasta
stilview: Kommando nicht gefunden.
stilview: kommandot finns inte
stilview: komut yok
stilview: nie znaleziono polecenia
stilview: níor aimsíodh an t-ordú
stilview: no se encontró la orden
stilview: no s'ha trobat l'ordre
stilview: opdracht niet gevonden
stilview: parancs nem található
stilview: perintah tidak ditemukan
stilview: príkaz nenájdený
stilview: příkaz nenalezen
stilview: команда не найдена
stilview: командата не е открита
stilview: 命令找不到
stilview: コマンドが見つかりません