: Right-click the .001 file and select "Extract Here" using 7-Zip or WinRAR. The software will automatically detect and join the other parts to recreate the full installer.

: You cannot open .001 alone. You must have all subsequent parts (e.g., .002 , .003 ) in the same folder.

The file is a multi-part archive typically associated with the Nighttime Imaging 'N' Astronomy (N.I.N.A.) software, a popular open-source tool for astrophotography.

: If you use an autoguider, follow the N.I.N.A. Imaging Tutorial to connect your camera and start guiding via the Guiding tab.