User-agent: *

Disallow: /*.doc
Disallow: /*.Doc
Disallow: /*.DOC

Disallow: /*.docx
Disallow: /*.Docx
Disallow: /*.DOCX

Disallow: /*.pdf
Disallow: /*.Pdf
Disallow: /*.PDF

Disallow: /*.ppt
Disallow: /*.Ppt
Disallow: /*.PPT

Disallow: /*.pptx
Disallow: /*.Pptx
Disallow: /*.PPTX

Disallow: /*.xls
Disallow: /*.Xls
Disallow: /*.XLS

Disallow: /*.xlsx
Disallow: /*.Xlsx
Disallow: /*.XLSX

Allow: /images/docs/ir/*.pdf
Allow: /images/docs/ir/*.Pdf
Allow: /images/docs/ir/*.PDF

Allow: /i/docs/ir/*.pdf
Allow: /i/docs/ir/*.Pdf
Allow: /i/docs/ir/*.PDF