The Multics file system stores the file name as a single string, not split into base name and extension components, allowing the "." to be just another character allowed in file names. It allows for variable-length filenames, permitting more than one dot, and hence multiple suffixes, as well as no dot, and hence no suffix. Some components of Multics, and applications running on it, use suffixes to indicate file types, but not all files are required to have a suffix — for example, executables and ordinary text files usually have no suffixes in their names.
tHE muLTics FiLe sYStEm sTOres The file NAme aS A single stRing noT splIt into basE NAme and exTEnsioN cOMpoNenTs ALlOwIng the "" tO BE Just AnotheR charactEr aLlowed iN fiLe nAmEs iT Allows for vaRIablE-LengtH filenAmes permIttIng more than one dOt and HenCe muLtiPle suFFIxes as Well aS no Dot aNd hence no sufFix somE cOmPoNEnTS of MuLticS and appliCaTioNs runNiNg On it use suFFIxeS tO InDicatE file typES bUt not all fILes aRE Required to havE a suffIX — foR example EXecUTableS and ordINary text fIlEs uSualLy haVE nO suffIxES In thEir nameS