Most are trap files. Even if the password works, the software inside is decades old and will not run properly on modern Windows (requires legacy components like Windows XP SP3 or Windows 7 with specific patches).
A common mistake users make is downloading "RAR Password Recovery" tools or "Wilcom E4.2 Keygens" from unverified sources. Wilcom E4.2.rar Password
A: You cannot. Wilcom no longer sells E4.2. They offer newer versions via subscription at wilcom.com. Most are trap files