What does Windows error code 1799 (ERROR_INVALID_SEPARATOR_FILE) mean?

 
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ERROR_UNKNOWN_PRINTPROCESSOR ERROR_INVALID_PRIORITY

ERROR_INVALID_SEPARATOR_FILE

The configured print separator file is invalid.

ERROR_INVALID_SEPARATOR_FILE is Win32 error 1799 (0x707). A printer queue can reference a separator page file through its configuration. The spooler validates that reference and the file format expected by the printing subsystem. This result does not mean a generic path separator character is invalid; it is specifically associated with print-job separator-page configuration.

Reasons the separator page is rejected

  • the configured path does not identify a readable separator file on the print server
  • the file contains unsupported or malformed separator escape commands
  • the spooler service account cannot access the file or its directory
  • migration copied the queue setting but omitted the referenced file
  • the file was replaced, truncated, encoded unexpectedly, or quarantined by security software

Evidence to preserve

Record print server and queue, configured pSepFile value, resolved file path, file size and hash, ACL, owner, modification time, spooler service identity, printer language, driver and print processor, and related spooler events. Keep a copy of the failing separator file before editing it so the exact parser input remains available.

How to investigate

Read the queue configuration from the target server and confirm the file exists locally where the spooler expects it. Test access under the service context rather than only as an administrator. Compare the file with a known-good separator page for the same printer language.

Inspect separator commands and line endings. Remove unsupported commands one at a time in a test queue, not on production jobs. If the queue does not require separator pages, clear the configuration through the supported printer API instead of leaving a dangling path.

Recovery and prevention

Restore a valid separator file, correct permissions, or disable separator pages for the queue. Restart the spooler only when necessary after configuration change and confirm that queued documents are not lost. Do not point all printers to one language-specific file without testing compatibility.

Print deployment tooling should package separator files with queues, verify hashes and ACLs, and validate pSepFile on the destination server. Configuration backups should include external referenced files, not only registry or queue metadata.

Difference from invalid print data

ERROR_INVALID_SEPARATOR_FILE concerns the queue’s separator page file. ERROR_INVALID_DATATYPE concerns the print-job data type accepted by a print processor. A damaged document submitted by a user is a separate input from the separator page.

Example

A restored print server has all queues, but the custom separator files were stored on a volume that was not migrated. Updating a queue returns 1799. Restoring the file with the correct ACL resolves the configuration without changing the printer driver.

References

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