“Rar files are basically zipped files and won't do anything unless unzipped or activated... so the chances of it doing anything dangerous... is very, very low. but not impossible.” Reddit · r/techsupport · 3 years ago
To view the patterns, you'll need an extraction tool like WinRAR or 7-Zip .
: As a Polish publication, the text instructions will be in Polish. However, crochet is a "universal language" of charts; if you can read symbolic diagrams, you can follow these patterns without knowing the language.
: Because this is a .rar archive found on file-sharing sites like Chomikuj.pl , you should always scan the file for malware before extracting its contents. Community Perspectives on RAR Safety