Download and install 7-Zip. Right-click the .001 file, select 7-Zip , and then click Extract Here or Extract to [folder name] .
You may be able to right-click the first file ( .001 ) and select Extract All directly in File Explorer. 25jkigfkpssj.7z.004
Use The Unarchiver or Unzip One to open the first part of the sequence. Download and install 7-Zip