Select > Extract Here (or use the Combine Files option).
The file is the first part of a split compressed archive created with 7-Zip . Files with this naming convention are broken into smaller pieces to make them easier to share or store. Key Facts About Your File 25n.7z.001
: Ensure every numbered part ( .001 , .002 , etc.) is in the same folder. Use 7-Zip or WinRAR : Right-click the .001 file. Select > Extract Here (or use the Combine Files option)