ERROR_INVALID_SEPARATOR_FILE - 1799 (0x707)
The specified separator file is invalid.
Updated: Feb 21, 2026
Technical Meaning
The ERROR_INVALID_SEPARATOR_FILE error code indicates that a specified separator file is invalid. This typically occurs when an application or system component attempts to use a file path with an unsupported or incorrect separator character, such as the backslash (\) on a network share where it might be expected to use the forward slash (/).
Error Details
The error code 1799 (0x707) is returned when the system encounters a path that contains an invalid separator. This can happen in various file operations, such as creating or accessing files and directories.
Usage Context
This error typically arises in scenarios where applications are handling file paths on network shares or when dealing with paths that contain characters not supported by the underlying file system or operating environment.
Developer Interpretation
Developers should interpret this error code to indicate a problem with path validation. The application must ensure that it uses appropriate separator characters for the specific context in which it is running, especially on network shares where different conventions may apply.
Common Causes
- Using an unsupported or incorrect separator character in file paths.
- Attempting to use backslashes (
\) on a network share where forward slashes (/) are expected. - Incorrect handling of path separators for cross-platform applications.
Related Errors
ERROR_PATH_NOT_FOUND(2)ERROR_INVALID_NAME(123)ERROR_BAD_NETPATH(67)
FAQ
Q: What does the error code 1799 mean?
A: The specified separator file is invalid.
Q: How can I resolve this issue?
A: Ensure that your application uses appropriate path separators for the operating environment. For network shares, use forward slashes (/) instead of backslashes (\).
Summary
The ERROR_INVALID_SEPARATOR_FILE error code indicates a problem with path validation in file operations. Developers should ensure their applications handle paths correctly based on the specific context and conventions of the underlying file system or operating environment.