diff --git a/src/ARCTokenization/ARCTokenization.fsproj b/src/ARCTokenization/ARCTokenization.fsproj
index d6c79b2..b44b1dd 100644
--- a/src/ARCTokenization/ARCTokenization.fsproj
+++ b/src/ARCTokenization/ARCTokenization.fsproj
@@ -12,6 +12,10 @@
     <SymbolPackageFormat>snupkg</SymbolPackageFormat>
   </PropertyGroup>
 
+  <ItemGroup>
+    <InternalsVisibleTo Include="ARCTokenization.Tests" />
+  </ItemGroup>
+
   <ItemGroup>
     <None Include="RELEASE_NOTES.md" />
     <Compile Include="structural_ontologies\AFSO.fs" />
@@ -34,6 +38,7 @@
     <Compile Include="Tokenization.fs" />
     <Compile Include="Workbook.fs" />
     <Compile Include="Worksheet.fs" />
+    <Compile Include="FileSystem.fs" />
     <Compile Include="TopLevelParsers.fs" />
   </ItemGroup>
 
diff --git a/src/ARCTokenization/FileSystem.fs b/src/ARCTokenization/FileSystem.fs
new file mode 100644
index 0000000..1ecf7bf
--- /dev/null
+++ b/src/ARCTokenization/FileSystem.fs
@@ -0,0 +1,54 @@
+namespace ARCTokenization
+
+open ControlledVocabulary
+open FSharpAux
+open FsSpreadsheet
+open ARCTokenization.Terms
+open ARCTokenization.StructuralOntology
+
+open System.IO
+open System
+open ControlledVocabulary
+
+module internal FS =
+
+    let tokenizeRelativeDirectoryPaths (rootPath:string) =
+        let root = System.Uri(rootPath)
+        seq {
+            for dir in Directory.EnumerateDirectories(rootPath, "*", SearchOption.AllDirectories) do
+                let currentUri =  System.Uri(dir)
+                yield CvParam(
+                    cvTerm = AFSO.``Directory Path``,
+                    v = root.MakeRelativeUri(currentUri).ToString()
+                )
+        }
+
+    let tokenizeAbsoluteDirectoryPaths  (rootPath:string) =
+        seq {
+                for dir in Directory.EnumerateDirectories(rootPath, "*", SearchOption.AllDirectories) do
+                    yield CvParam(
+                        cvTerm = AFSO.``Directory Path``,
+                        v = dir.Replace("\\","/")
+                    )
+            }    
+
+
+    let tokenizeRelativeFilePaths (rootPath:string) =
+        let root = System.Uri(rootPath)
+        seq {
+            for file in Directory.EnumerateFiles(rootPath, "*", SearchOption.AllDirectories) do
+                let currentFileUri =  System.Uri(file)
+                yield CvParam(
+                    cvTerm = AFSO.``File Path``, 
+                    v = root.MakeRelativeUri(currentFileUri).ToString()
+                )
+        }
+
+    let tokenizeAbsoluteFilePaths (rootPath:string) =
+        seq {
+            for file in Directory.EnumerateFiles(rootPath, "*", SearchOption.AllDirectories) do
+            yield CvParam(
+                cvTerm = AFSO.``File Path``, 
+                v = file.Replace("\\","/")
+            )
+        }
\ No newline at end of file
diff --git a/src/ARCTokenization/Tokenization.fs b/src/ARCTokenization/Tokenization.fs
index 456d526..9b855c1 100644
--- a/src/ARCTokenization/Tokenization.fs
+++ b/src/ARCTokenization/Tokenization.fs
@@ -7,7 +7,7 @@ open ARCTokenization.Terms
 
 module Tokenization = 
     
-    let convertTokens (keyParser: IParam list -> string -> (ParamValue -> IParam)) (line : FsCell seq) =
+    let convertMetadataTokens (keyParser: IParam list -> string -> (ParamValue -> IParam)) (line : FsCell seq) =
         match line |> Seq.toList with
         | [] -> failwith "Cannot convert nothin"
         | key :: [] -> 
diff --git a/src/ARCTokenization/TopLevelParsers.fs b/src/ARCTokenization/TopLevelParsers.fs
index 91d2602..b73e421 100644
--- a/src/ARCTokenization/TopLevelParsers.fs
+++ b/src/ARCTokenization/TopLevelParsers.fs
@@ -5,6 +5,52 @@ open FSharpAux
 open FsSpreadsheet
 open FsSpreadsheet.ExcelIO
 
+type FileSystem =
+    
+    /// <summary>
+    /// Returns all directories in the given rootPath as a list of CvParams containing the annotated absolute directory paths.
+    ///
+    /// Note that rootPath must be an absolute path ending with a trailing slash.
+    /// </summary>
+    /// <param name="rootPath">absolute path ending with a trailing slash</param>
+    static member parseAbsoluteDirectoryPaths(
+        rootPath:string
+    ) =
+        FS.tokenizeAbsoluteDirectoryPaths rootPath
+
+    /// <summary>
+    /// Returns all files in the given rootPath as a list of CvParams containing the annotated absolute file paths.
+    ///
+    /// Note that rootPath must be an absolute path ending with a trailing slash.
+    /// </summary>
+    /// <param name="rootPath">absolute path ending with a trailing slash</param>
+    static member parseAbsoluteFilePaths(
+        rootPath:string
+    ) =
+        FS.tokenizeAbsoluteFilePaths rootPath
+
+    /// <summary>
+    /// Returns all directories in the given rootPath as a list of CvParams containing the annotated relative directory paths.
+    ///
+    /// Note that rootPath must be an absolute path ending with a trailing slash.
+    /// </summary>
+    /// <param name="rootPath">absolute path ending with a trailing slash</param>
+    static member parseRelativeDirectoryPaths(
+        rootPath:string
+    ) =
+        FS.tokenizeRelativeDirectoryPaths rootPath
+
+    /// <summary>
+    /// Returns all files in the given rootPath as a list of CvParams containing the annotated relative file paths.
+    ///
+    /// Note that rootPath must be an absolute path ending with a trailing slash.
+    /// </summary>
+    /// <param name="rootPath">absolute path ending with a trailing slash</param>
+    static member parseRelativeFilePaths(
+        rootPath:string
+    ) =
+        FS.tokenizeRelativeFilePaths rootPath
+
 type Investigation =
 
     /// <summary>
@@ -21,7 +67,7 @@ type Investigation =
         
         FsWorkbook.fromXlsxFile path
         |> Workbook.getInvestigationMetadataSheet useLastSheetOnIncorrectName
-        |> Worksheet.parseRowsWith (Tokenization.convertTokens MetadataSheet.parseInvestigationKey)
+        |> Worksheet.parseRowsWith (Tokenization.convertMetadataTokens MetadataSheet.parseInvestigationKey)
 
     /// <summary>
     /// Parses the metadata sheet from an ISA Study XLSX file as a flat list of `IParam`s.
@@ -54,7 +100,7 @@ type Study =
         
         FsWorkbook.fromXlsxFile path
         |> Workbook.getStudyMetadataSheet useLastSheetOnIncorrectName
-        |> Worksheet.parseRowsWith (Tokenization.convertTokens MetadataSheet.parseStudyKey)
+        |> Worksheet.parseRowsWith (Tokenization.convertMetadataTokens MetadataSheet.parseStudyKey)
 
     /// <summary>
     /// Parses the metadata sheet from an ISA Study XLSX file as a flat list of `IParam`s.
@@ -95,7 +141,7 @@ type Assay =
         
         FsWorkbook.fromXlsxFile path
         |> Workbook.getAssayMetadataSheet useLastSheetOnIncorrectName
-        |> Worksheet.parseRowsWith (Tokenization.convertTokens MetadataSheet.parseAssayKey)
+        |> Worksheet.parseRowsWith (Tokenization.convertMetadataTokens MetadataSheet.parseAssayKey)
 
     /// <summary>
     /// Parses the metadata sheet from an ISA Assay XLSX file as a flat list of `IParam`s.
diff --git a/tests/ARCTokenization.Tests/ARCTokenization.Tests.fsproj b/tests/ARCTokenization.Tests/ARCTokenization.Tests.fsproj
index 308ee53..9f588d5 100644
--- a/tests/ARCTokenization.Tests/ARCTokenization.Tests.fsproj
+++ b/tests/ARCTokenization.Tests/ARCTokenization.Tests.fsproj
@@ -7,7 +7,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <None Include="Fixtures\**" CopyToOutputDirectory="Always" />
+    <None Include="Fixtures\**" CopyToOutputDirectory="Always"/>
     <Compile Include="TestUtils.fs" />
     <Compile Include="TestObjects.fs" />
     <Compile Include="ReferenceObjects.fs" />
@@ -36,7 +36,12 @@
   </ItemGroup>
 
   <ItemGroup>
+    <ProjectReference Include="..\..\src\ControlledVocabulary\ControlledVocabulary.fsproj" />
     <ProjectReference Include="..\..\src\ARCTokenization\ARCTokenization.fsproj" />
   </ItemGroup>
 
+  <ItemGroup />
+
+  <ItemGroup />
+
 </Project>
diff --git a/tests/ARCTokenization.Tests/Fixtures/testPaths/1/1_1/.gitkeep b/tests/ARCTokenization.Tests/Fixtures/testPaths/1/1_1/.gitkeep
new file mode 100644
index 0000000..e69de29
diff --git a/tests/ARCTokenization.Tests/Fixtures/testPaths/2/2_1/.gitkeep b/tests/ARCTokenization.Tests/Fixtures/testPaths/2/2_1/.gitkeep
new file mode 100644
index 0000000..e69de29
diff --git a/tests/ARCTokenization.Tests/Fixtures/testPaths/2/2_2/2_2_1/.gitkeep b/tests/ARCTokenization.Tests/Fixtures/testPaths/2/2_2/2_2_1/.gitkeep
new file mode 100644
index 0000000..e69de29
diff --git a/tests/ARCTokenization.Tests/ReferenceObjects.fs b/tests/ARCTokenization.Tests/ReferenceObjects.fs
index 4bd1373..c16956c 100644
--- a/tests/ARCTokenization.Tests/ReferenceObjects.fs
+++ b/tests/ARCTokenization.Tests/ReferenceObjects.fs
@@ -96,7 +96,7 @@ module Tokenization =
                 lmaoooo", ParamValue.Value 1)
             ]
 
-    module ConvertTokens =
+    module ConvertMetadataTokens =
         
         let referenceTerms = [
             CvTerm.create(accession = "1", name = "ReferenceTerm1", ref = "1")
@@ -150,4 +150,66 @@ module Tokenization =
             UserParam("fk u lmaooooo", ParamValue.CvValue Terms.StructuralTerms.metadataSectionKey)
             UserParam("fk u lmaooooo", ParamValue.Value "some value")
             UserParam("fk u lmaooooo", ParamValue.Value "another value")
-        ]
\ No newline at end of file
+        ]
+
+    module FileSystem =
+        
+        let referenceRelativeDirectoryPaths = 
+            [
+                @"1"
+                @"2"
+                @"1/1_1"
+                @"2/2_1"
+                @"2/2_2"
+                @"2/2_2/2_2_1"
+            ]
+            |> List.map (fun v ->
+                CvParam(
+                    cvTerm = CvTerm.create("AFSO:00000010","Directory Path","AFSO"),
+                    v = v
+                )
+            )
+
+        let referenceAbsoluteDirectoryPaths(root) =
+            [
+                @"1"
+                @"2"
+                @"1/1_1"
+                @"2/2_1"
+                @"2/2_2"
+                @"2/2_2/2_2_1"
+            ]
+            |> List.map (fun f -> System.IO.Path.Combine(root, f))
+            |> List.map (fun v ->
+                CvParam(
+                    cvTerm = CvTerm.create("AFSO:00000010","Directory Path","AFSO"),
+                    v = v.Replace("\\", "/")
+                )
+            )
+
+        let referenceRelativeFilePaths = 
+            [
+                @"1/1_1/.gitkeep"
+                @"2/2_1/.gitkeep"
+                @"2/2_2/2_2_1/.gitkeep"
+            ]
+            |> List.map (fun v ->
+                CvParam(
+                    cvTerm = CvTerm.create("AFSO:00000009","File Path","AFSO"),
+                    v = v
+                )
+            )
+
+        let referenceAbsoluteFilePaths(root) =
+            [
+                @"1/1_1/.gitkeep"
+                @"2/2_1/.gitkeep"
+                @"2/2_2/2_2_1/.gitkeep"
+            ]
+            |> List.map (fun f -> System.IO.Path.Combine(root, f))
+            |> List.map (fun v ->
+                CvParam(
+                    cvTerm = CvTerm.create("AFSO:00000009","File Path","AFSO"),
+                    v = v.Replace("\\", "/")
+                )
+            )
\ No newline at end of file
diff --git a/tests/ARCTokenization.Tests/TokenizationTests/ParserFunctions.fs b/tests/ARCTokenization.Tests/TokenizationTests/ParserFunctions.fs
index cff94fb..de52deb 100644
--- a/tests/ARCTokenization.Tests/TokenizationTests/ParserFunctions.fs
+++ b/tests/ARCTokenization.Tests/TokenizationTests/ParserFunctions.fs
@@ -4,6 +4,55 @@ open ControlledVocabulary
 open ARCTokenization
 open Xunit
 
+module FileSystem =
+    
+    open ReferenceObjects.Tokenization.FileSystem
+    open System.IO
+
+    let parsedRelativeDirectoryPaths = FS.tokenizeRelativeDirectoryPaths (Path.GetFullPath("Fixtures/testPaths/")) |> List.ofSeq
+
+    [<Fact>]
+    let ``Relative directory paths are tokenized correctly`` () =
+        let actual = parsedRelativeDirectoryPaths
+        let expected = referenceRelativeDirectoryPaths
+        Assert.All(
+            List.zip expected actual,
+            fun (e, a) -> Assert.True(e.Equals(a))
+        )
+
+    let parsedRelativeFilePaths = FS.tokenizeRelativeFilePaths (Path.GetFullPath("Fixtures/testPaths/")) |> List.ofSeq 
+
+    [<Fact>]
+    let ``Relative file paths are tokenized correctly`` () =
+        let actual = parsedRelativeFilePaths
+        let expected = referenceRelativeFilePaths
+        Assert.All(
+            List.zip expected actual,
+            fun (e, a) -> Assert.True(e.Equals(a))
+        )
+
+    let parsedAbsoluteDirectoryPaths = FS.tokenizeAbsoluteDirectoryPaths (Path.GetFullPath("Fixtures/testPaths/")) |> List.ofSeq
+
+    [<Fact>]
+    let ``Absolute directory paths are tokenized correctly`` () =
+        let actual = parsedAbsoluteDirectoryPaths
+        let expected = referenceAbsoluteDirectoryPaths(Path.Combine(System.Environment.CurrentDirectory, "Fixtures/testPaths/"))
+        Assert.All(
+            List.zip expected actual,
+            fun (e, a) -> Assert.True(e.Equals(a))
+        )
+
+    let parsedAbsoluteFilePaths = FS.tokenizeAbsoluteFilePaths (Path.GetFullPath("Fixtures/testPaths/")) |> List.ofSeq 
+
+    [<Fact>]
+    let ``Absolute file paths are tokenized correctly`` () =
+        let actual = parsedAbsoluteFilePaths
+        let expected = referenceAbsoluteFilePaths(Path.Combine(System.Environment.CurrentDirectory, "Fixtures/testPaths/"))
+        Assert.All(
+            List.zip expected actual,
+            fun (e, a) -> Assert.True(e.Equals(a))
+        )
+
 module ParseKeyWithTerms =
     
     open ReferenceObjects.Tokenization.KeyParser
@@ -75,12 +124,12 @@ module ParseKeyWithTerms =
             fun (e, a) -> Assert.True(Param.equals e a)
         )
 
-module ConvertTokens = 
+module ConvertMetadataTokens = 
     
-    open ReferenceObjects.Tokenization.ConvertTokens
+    open ReferenceObjects.Tokenization.ConvertMetadataTokens
     open FsSpreadsheet
 
-    let tokenizer : FsCell seq -> IParam list = Tokenization.convertTokens (MetadataSheet.parseKeyWithTerms referenceTerms)
+    let tokenizer : FsCell seq -> IParam list = Tokenization.convertMetadataTokens (MetadataSheet.parseKeyWithTerms referenceTerms)
 
     let parsedCvParams = tokenizer referenceRow
 
@@ -148,4 +197,4 @@ module ConvertTokens =
     let ``UserParam row has metadata section key as value of first token`` () =
         let actual = parsedUserParams.[0] |> Param.getValueAsTerm
         let expected = Terms.StructuralTerms.metadataSectionKey
-        Assert.Equal(expected, actual)
\ No newline at end of file
+        Assert.Equal(expected, actual)