Move help from Comment-based to md. Relocate functions (sans help)

ExportedCommands/ConvertTo-ExcelXlsx.ps1

@@ -0,0 +1,55 @@
+Function ConvertTo-ExcelXlsx {
+    [CmdletBinding()]
+    Param
+    (
+        [parameter(Mandatory = $true, ValueFromPipeline)]
+        [string]$Path,
+        [parameter(Mandatory = $false)]
+        [switch]$Force
+    )
+    Process {
+        if (-Not ($Path | Test-Path) ) {
+            throw "File not found"
+        }
+        if (-Not ($Path | Test-Path -PathType Leaf) ) {
+            throw "Folder paths are not allowed"
+        }
+
+        $xlFixedFormat = 51 #Constant for XLSX Workbook
+        $xlsFile = Get-Item -Path $Path
+        $xlsxPath = "{0}x" -f $xlsFile.FullName
+
+        if ($xlsFile.Extension -ne ".xls") {
+            throw "Expected .xls extension"
+        }
+
+        if (Test-Path -Path $xlsxPath) {
+            if ($Force) {
+                try {
+                    Remove-Item $xlsxPath -Force
+                }
+                catch {
+                    throw "{0} already exists and cannot be removed. The file may be locked by another application." -f $xlsxPath
+                }
+                Write-Verbose $("Removed {0}" -f $xlsxPath)
+            }
+            else {
+                throw "{0} already exists!" -f $xlsxPath
+            }
+        }
+
+        try {
+            $Excel = New-Object -ComObject "Excel.Application"
+        }
+        catch {
+            throw "Could not create Excel.Application ComObject. Please verify that Excel is installed."
+        }
+
+        $Excel.Visible = $false
+        $null = $Excel.Workbooks.Open($xlsFile.FullName)
+        $Excel.ActiveWorkbook.SaveAs($xlsxPath, $xlFixedFormat)
+        $Excel.ActiveWorkbook.Close()
+        $Excel.Quit()
+    }
+}
+