A file that refuses to open is not always corrupt. The extension may be wrong, the download incomplete, the content encrypted, the codec unsupported or the software simply incompatible. Work from low-risk checks toward more involved recovery.
Step 1 — Check size and where it came from
A suspiciously small or zero-byte file may be a failed download or a web error page saved under the wrong extension. Compare the size with the sender's description or download page. If the transfer seems incomplete, download again from the original trusted source; do not overwrite the only copy.
Step 2 — Identify the real format
Inspect the bytes with the file type detector. If the header suggests ZIP but the name ends in .docx, the file could be a legitimate DOCX package. If the extension and header disagree, investigate the source before renaming anything. Renaming a file does not convert its contents.
Step 3 — Try a low-risk preview
Use the Universal File Viewer for safe inspection. Plain text or JSON may reveal whether a response is actually an error message. For ZIP-based formats, the ZIP contents viewer can identify some archive structure problems. A successful ZIP listing does not establish that every member is valid.
Step 4 — Look for protection or compatibility limits
Password-protected documents and archives require the legitimate password and compatible software. For video or audio, the browser may lack the particular codec even if the container format is recognized. Modern spreadsheet files may contain features beyond the browser preview. Read Office and EPUB preview limitations before deciding that content is missing.
Step 5 — Separate damage from lack of support
If several trusted viewers report structural errors on the same copy, corruption becomes more likely. A mismatch between expected and calculated SHA-256 values indicates changed bytes when you have a trustworthy reference digest. Do not repeatedly run speculative repair programs on the only original; make a copy and document the errors first.
Step 6 — Recover cautiously
Restore from a version history, backup or original sender when possible. For critical business records, consider format-specific professional recovery services, but compare their privacy practices and cost. OpenMyFile is an inspection aid; it cannot reconstruct permanently missing bytes or decrypt protected files.
Step 7 — Recheck before sharing
Once a valid copy opens in a trusted native application, verify meaningful content rather than just a successful load: tables, images, fonts, formulas, page count and attachments as appropriate. Before distributing sensitive files, review the safe opening checklist and remove confidential information using suitable tools.