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FileHasher is a Windows GUI utility developed by FSP Productions, LLC, designed for computing cryptographic hashes of files and folders. Its core purpose is to generate hashes for individual files or entire folder trees, making it suitable for data integrity verification, file auditing, backup validation, and confirming that files have not been altered during transfer or storage. The application fits within the file integrity and checksum verification category of utilities. A central feature is its ability to write .sha256-style sidecar hash files alongside the hashed content, and it can later verify those existing sidecar files to detect changes or corruption. Results can also be exported to CSV format, enabling record keeping, reporting, and further analysis in spreadsheet or data-processing tools. In addition to standard file and folder hashing, FileHasher can optionally open .msi installer packages in read-only mode and hash the files contained inside them individually, which is useful for inspecting installer contents without executing or modifying the package. The software is distributed as a signed, self-contained single executable, so installation is straightforward and no .NET runtime install is required on the target system, simplifying deployment on machines where adding frameworks is impractical or restricted. The current version is 0.4.0, and the catalog records three versions in total, indicating ongoing development and iterative releases of the tool. With its combination of graphical interface, sidecar file creation and verification, CSV export, and MSI package inspection, FileHasher serves users such as system administrators, auditors, and power users who need a lightweight, portable hashing solution on Windows. Its portability, code signing, and lack of external runtime dependencies make it practical for use across multiple machines, including locked-down environments, while its verification and export capabilities support repeatable integrity-checking workflows over time.
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