system() expects a string (or a list of strings) — not a mixture of whitespace-separated strings and barewords. 

system('"C:\\Program files\\Borland\\SilkTest\\partner.exe" -q -r "C:\
+\Perfrom_Acce\\Investigate\\Investigate_ACCEPTANCE.t" WelcomePagesOn'
+);

[download]

(note the single quotes around the entire command)

In reply to Re: How to execute .exe from perl script by almut
in thread How to execute .exe from perl script by Rijwan

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