- File extension "rtu"
- File extension "rtt"
- File extension "rtf1"
- File extension "rsi"
- File extension "rqt"
- File extension "rpp"
- File extension "rpl"
- File extension "rpe"
- File extension "root"
- File extension "rna"
- File extension "rmdu"
- File extension "rmb"
- File extension "rm0"
- File extension "rgr"
- File extension "rgi"
- File extension "rge"
- File extension "resume"
- File extension "request"
- File extension "red"
- File extension "record"
- File extension "rco"
- File extension "rcn"
- File extension "rc4"
- File extension "rbw"
- File extension "rbh"
- File extension "rap"
- File extension "rab"
- File extension "r92"
- File extension "r80"
- File extension "r79"