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Start with the file and its source
Check the file’s name and extension. A ZIP archive normally ends in .zip, but a familiar-looking name alone does not prove that the file is a valid or safe archive. If it came from an untrusted source, do not open or extract it.
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If the download was interrupted, the file is unexpectedly small, or the error appeared after a failed download, download it again from the original sender or service. A partial archive can look like a format or corruption problem.
Try the built-in extractor for your device
Windows
In File Explorer, right-click the ZIP folder and choose Extract All…, then select a destination and extract. To take out one item instead, open the ZIP and drag that item to a folder. These are Microsoft’s documented steps for Windows: Zip and unzip files.
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Format support depends on Windows version. Microsoft says Windows 11 version 24H2 supports ZIP, RAR, 7z, and TAR, but does not support operations on encrypted archive files. Do not assume that this format support applies to older Windows releases. If the archive is encrypted or uses a format your Windows version cannot handle, use a compatible archive application.
Android
In Files by Google, locate the .zip file, tap it, and choose Extract. The app supports ZIP files only, and the extracted files are saved beside the original ZIP. Google notes that a full device can cause extraction to fail; free up storage or move data to an SD card, then try again. See Google’s unzip instructions.
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Open the Files app, find the ZIP, and tap it. Files creates an extracted folder; tap that folder to view its contents. Apple documents this workflow for ZIP files, not every archive format or encryption method: Create or open ZIP files on your iPhone or iPad.
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A password is requested
Ask the person or service that created the archive for the correct password, and check that you are using the password for this particular file. If the archive is encrypted, the extractor must support that encryption as well as the archive format. Microsoft says File Explorer in Windows 11 version 24H2 does not perform operations on encrypted archives, so a compatible third-party archive application may be needed.
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Windows cannot reveal an unknown archive password. A Microsoft Q&A community response likewise says an unknown password cannot be removed with Windows tools; it is not a formal product specification. See the Microsoft Q&A answer. Do not treat a password prompt as evidence that the ZIP is corrupt.
“Not an archive,” header, or unsupported-method errors
The file may not be a ZIP despite its name, may be incomplete, or may contain a header or compression method the extractor cannot handle. 7-Zip’s FAQ describes incorrect headers and unsupported methods among possible reasons a ZIP cannot be opened. If you trust the source, try a current archive utility that supports the file’s format; a second application can help identify a compatibility issue, but it cannot guarantee extraction.
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CRC or data errors during extraction
A CRC or data error means the extractor encountered a problem with the archive contents while reading them. It is different from a password prompt or simply lacking support for the format. The archive may be damaged or incomplete; first get a fresh copy from the original source rather than assuming a repair will work.
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7-Zip publishes recovery guidance specifically for corrupted .7z archives, and warns that some cases are difficult or recovery may be incomplete. That guidance is not a general ZIP-repair guarantee: How to recover corrupted 7z archive.
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Extraction fails without a clear format error
Check that the destination folder is writable and that the device has enough free space for the extracted contents. The archive’s compressed size can be much smaller than the space its files need after extraction. On Android, Google specifically identifies a full device as a possible cause; free space or move data to an SD card before retrying.
Quick Recap
Choose the next step by symptom
| What you see | What to try next |
|---|---|
| Download stopped early, file is unexpectedly small, or CRC/data error | Download a fresh copy from the original source. |
| Password prompt | Get the correct password from the sender or service; use an extractor that supports the archive’s encryption. |
| Unsupported format or method | Check the device and OS version, then try a compatible archive utility. |
| Storage or write failure | Free destination or device space and extract to a folder where you can write. |
| File is from an untrusted source | Do not open or extract it. |
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