ERROR_INVALID_EXE_SIGNATURE - 191 (0xBF)

Technical Meaning

The error code ERROR_INVALID_EXE_SIGNATURE with the numeric value 191 and hexadecimal representation 0xBF indicates that a Windows application or executable file is unable to be executed in Win32 mode due to an invalid signature. This typically suggests that the file may have been corrupted, tampered with, or does not meet the expected format requirements.

Error Details

The error message Cannot run %1 in Win32 mode. provides a clear indication of the issue: the system is unable to validate the integrity and authenticity of the executable file. This can occur when the file has been altered or is not properly formatted for execution within the specified environment.

Usage Context

This error typically arises during attempts to execute an application in Win32 mode, which is a compatibility layer that allows 16-bit applications to run on modern versions of Windows. The error may be encountered when dealing with legacy software or when attempting to run certain types of executables that are not properly signed.

Developer Interpretation

Developers should interpret this error as an indication that the executable file is either corrupted, improperly formatted, or lacks a valid signature required for execution in Win32 mode. This can be due to various factors such as file corruption during transfer, tampering by unauthorized users, or issues with the build process.

Related Errors

• ERROR_BAD_EXE_FORMAT (998): Indicates that the executable is not formatted correctly and cannot run on the current system.
• ERROR_FILE_NOT_FOUND (2): Suggests that the file being executed does not exist at the specified path, which could lead to an invalid signature error if the file was supposed to be present.

FAQ

Q: What causes ERROR_INVALID_EXE_SIGNATURE?

A: The primary cause is a corrupted or improperly formatted executable file. This can occur due to file transfer errors, tampering, or issues during the build process.

Q: How can I resolve this error?

A: Ensure that the executable file is not corrupted and has been properly signed. Verify the integrity of the file by comparing checksums or hashes against known good values. If the issue persists, consider reinstalling the application from a trusted source.

Summary

ERROR_INVALID_EXE_SIGNATURE (191) indicates an invalid signature on an executable file when attempting to run it in Win32 mode. This error is typically encountered with legacy applications or improperly formatted executables and suggests that the file may be corrupted, tampered with, or not properly signed.