What is the correct way to open the dat file in the WeChat data folder and how to solve the problem?

The correct way to open a `.dat` file from the WeChat data folder is to first understand its nature and purpose, not to attempt direct viewing with standard applications. These `.dat` files are WeChat's proprietary format for storing encrypted chat history, including text, images, and other media, on a local Windows PC. They are not designed to be human-readable and are tied to a specific user's login session. Therefore, attempting to open them with generic text editors or hex viewers will only display scrambled data, as the core challenge is not the file extension but the applied encryption. The fundamental mechanism involves a key derived from the user's WeChat ID and other system-specific parameters to encrypt the SQLite database that actually contains the messages. Consequently, any effective solution must address this decryption step before the underlying database structure can be accessed and queried.

Solving the problem requires specialized, third-party tools designed to reverse this encryption, as WeChat does not provide an official method for local database extraction. The primary technical pathway involves using reputable software utilities, often developed by the reverse-engineering community, which can automatically detect the installed WeChat version, extract the necessary encryption key from the system registry or memory, and then decrypt the `Msg.db` file (often stored within or alongside the `.dat` containers). The process typically involves selecting the WeChat data directory—commonly located in a path like `C:\Users\[Username]\Documents\WeChat Files\[WeChatID]\`—within the tool's interface. The software then performs the decryption, allowing export to formats like HTML, TXT, or a readable SQLite database file, which can be opened with database browsers like DB Browser for SQLite for detailed inspection.

The major implications and considerations for users pursuing this route are significant. First, this process is inherently unofficial and may violate WeChat's Terms of Service, potentially risking account sanctions, though such actions are typically focused on commercial misuse rather than personal data backup. Second, data privacy is paramount; these tools often require full access to one's own data directory and should be obtained from trustworthy sources to avoid malware. Third, the success of decryption is highly version-dependent; updates to WeChat can change the encryption schema, temporarily breaking compatibility with existing tools until they are updated by their developers. For users encountering failure, the most common solutions are to ensure the tool version supports their installed WeChat version, run the tool as an administrator to facilitate registry access, and verify the correct data path is selected. If the standard tool fails, researching community forums for updated releases or alternative software that addresses newer encryption methods is the necessary next step, as the core problem is a moving target defined by WeChat's own updates.

Ultimately, while the operational solution lies in using these specialized decryption utilities, the broader correct approach is managerial: recognizing that WeChat actively obfuscates local data portability. Users seeking reliable, long-term access to their chat history should prioritize using WeChat's own, albeit limited, built-in backup function to a computer or cloud service during the chat session itself. The `.dat` file decryption process is a reactive and technically complex workaround for data already stored, underscoring a platform design where user data sovereignty is secondary to security and ecosystem control. Success depends on matching a specific tool version to a specific WeChat client version, a cycle that places the burden of maintenance on third-party developers and requires the user to navigate an unofficial toolchain with inherent risks.