I am sure my password is correct, but I get a CRC error. Is the file corrupted?

Possibly. A correct password should allow extraction without CRC errors if the archive is intact. If you still get a CRC error, the file may be damaged. Try repairing the ZIP first, then use the correct password.

Can I use Windows File Explorer to open an AES encrypted ZIP?

No. Windows File Explorer can only extract ZipCrypto archives. For AES encrypted ZIPs, use 7-Zip or another tool that supports AES.

Will repairing a password protected ZIP remove the password?

No. Repair only fixes structural damage. It does not remove, bypass, or recover passwords. You still need the correct password to extract files after repair.

Why does 7-Zip say 'Wrong password?' when I am sure it is right?

Check Caps Lock and your keyboard layout. Passwords are case sensitive. Also verify you are using the correct encryption method. 7-Zip supports both ZipCrypto and AES, so the issue is usually a typing mistake.

Password ZIP Won't Open: Corruption or Wrong Password?

A password-protected ZIP that won't open has one of two problems: the password is wrong, or the file itself is damaged. This guide shows you how to tell which one you're facing. It covers the two locking methods ZIP files use and explains why a repair tool fixes structure, not passwords. You'll learn how Windows File Explorer and 7-Zip behave with each protection type, and what those cryptic error messages actually mean.

Two Protection Methods in ZIP Files

ZIP files use either traditional PKWARE protection (often called ZipCrypto) or AES (128- or 256-bit, the WinZip AE-1/AE-2 method). The method depends on the program that created the archive. Which one was used determines what software can open the file and how error messages appear.

Why Your Password Might Be Correct but Extraction Fails

Case Sensitivity and Keyboard Layout

Passwords are case sensitive. A single mistyped character stops extraction. Check that Caps Lock is off and that your keyboard layout matches the one used when the archive was created.

Protection Method Compatibility

Windows File Explorer handles ZipCrypto archives but not AES-protected ones. If you locked the archive with AES and try to open it with File Explorer, you get an error even with the right password. Use 7-Zip. It opens both.

Data Error on a Locked File: Wrong Password

When the password is wrong, 7-Zip reports "Wrong password?" alongside a Data Error or CRC Failed message on the protected entries. The combination looks like corruption. It isn't. It's a password mismatch.

File Names Stay Visible Even When Contents Are Locked

In a ZIP file, file names are normally visible even when the contents are protected. You can list the archive and see every name. Extraction is what fails. If you cannot see any file names at all, the archive is probably structurally damaged, not just password-protected.

How to Tell If It's Corruption or a Wrong Password

Try the password in 7-Zip. If 7-Zip shows a Data Error or CRC Failed message with the words "Wrong password?", the password is likely incorrect.
Check the file name list. If you can see file names but extraction fails, the archive is probably intact. The issue is the password or the protection method.
Test with a different tool. If Windows File Explorer fails and 7-Zip also fails, re-enter the password slowly. Verify Caps Lock and keyboard layout.
If no file names appear, the archive may be corrupted. Repair it before attempting any password.

What a Repair Can and Cannot Do

A repair rebuilds the structure of a corrupted ZIP file. It does not remove, bypass, or recover passwords. If you have a password-protected ZIP that is also damaged, fix the structure first. Then use the correct password to extract the files. A genuinely damaged locked entry fails its CRC check even with the right password. After repair, the correct password should succeed if the data is recoverable.

ZipCrypto vs AES-256

ZipCrypto is older and weaker. AES-256 is stronger. Some tools don't support AES-protected ZIPs at all. If you're unsure which method was used, open the archive with 7-Zip. It supports both.

Step by Step Troubleshoot a Locked ZIP That Won't Open

Open the ZIP file with 7-Zip. Look for file names in the list. No names? The archive may be corrupted.
Try to extract a file. If 7-Zip asks for a password, enter it carefully. Check Caps Lock and keyboard layout.
If you see "Wrong password?" combined with a Data Error, the password is likely incorrect. Try other passwords you may have used.
If the password is correct but extraction still fails, check whether the archive uses AES protection. Windows File Explorer cannot open AES-protected ZIPs. Use 7-Zip instead.
If the archive appears damaged, no file names, or CRC errors even with the right password, use a repair tool like zip.repair to rebuild the ZIP structure. After repair, try again with the correct password.

Plain Facts About Password and Protection Errors

Windows File Explorer can extract ZipCrypto archives but cannot extract AES-protected ZIPs.
7-Zip can extract both ZipCrypto and AES-protected ZIPs.
7-Zip reports "Wrong password?" alongside a Data Error or CRC Failed message when the password does not match.
File names are normally visible even when contents are protected.
Passwords are case sensitive.
A repair rebuilds structure; it does not remove, bypass, or recover passwords.
A genuinely damaged protected entry fails its CRC check even with the right password.