diff --git a/CHANGELOG.md b/CHANGELOG.md
index 1675fab3..3605f1a8 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -28,6 +28,7 @@ and this project adheres to [Semantic Versioning](https://semver.org).
 - Fix ODS Reader when no DC namespace are defined [#1182](https://github.com/PHPOffice/PhpSpreadsheet/pull/1182)
 - Fixed Functions->ifCondition for allowing <> and empty condition [#1206](https://github.com/PHPOffice/PhpSpreadsheet/pull/1206)
 - Validate XIRR inputs and return correct error values [#1120](https://github.com/PHPOffice/PhpSpreadsheet/issues/1120)
+- Allow to read xlsx files with exotic workbook names like "workbook2.xml" [#1183](https://github.com/PHPOffice/PhpSpreadsheet/pull/1183)
 
 ## [1.9.0] - 2019-08-17
 
diff --git a/src/PhpSpreadsheet/Reader/Xlsx.php b/src/PhpSpreadsheet/Reader/Xlsx.php
index 1c1351f7..4c107505 100644
--- a/src/PhpSpreadsheet/Reader/Xlsx.php
+++ b/src/PhpSpreadsheet/Reader/Xlsx.php
@@ -77,34 +77,17 @@ class Xlsx extends BaseReader
     {
         File::assertFile($pFilename);
 
-        $xl = false;
-        // Load file
+        $result = false;
         $zip = new ZipArchive();
-        if ($zip->open($pFilename) === true) {
-            // check if it is an OOXML archive
-            $rels = simplexml_load_string(
-                $this->securityScanner->scan(
-                    $this->getFromZipArchive($zip, '_rels/.rels')
-                ),
-                'SimpleXMLElement',
-                Settings::getLibXmlLoaderOptions()
-            );
-            if ($rels !== false) {
-                foreach ($rels->Relationship as $rel) {
-                    switch ($rel['Type']) {
-                        case 'http://schemas.openxmlformats.org/officeDocument/2006/relationships/officeDocument':
-                            if (basename($rel['Target']) == 'workbook.xml') {
-                                $xl = true;
-                            }
 
-                            break;
-                    }
-                }
-            }
+        if ($zip->open($pFilename) === true) {
+            $workbookBasename = $this->getWorkbookBaseName($zip);
+            $result = !empty($workbookBasename);
+
             $zip->close();
         }
 
-        return $xl;
+        return $result;
     }
 
     /**
@@ -357,8 +340,9 @@ class Xlsx extends BaseReader
 
         //    Read the theme first, because we need the colour scheme when reading the styles
         //~ http://schemas.openxmlformats.org/package/2006/relationships"
+        $workbookBasename = $this->getWorkbookBaseName($zip);
         $wbRels = simplexml_load_string(
-            $this->securityScanner->scan($this->getFromZipArchive($zip, 'xl/_rels/workbook.xml.rels')),
+            $this->securityScanner->scan($this->getFromZipArchive($zip, "xl/_rels/${workbookBasename}.rels")),
             'SimpleXMLElement',
             Settings::getLibXmlLoaderOptions()
         );
@@ -2026,4 +2010,38 @@ class Xlsx extends BaseReader
 
         return (bool) $xsdBoolean;
     }
+
+    /**
+     * @param ZipArchive $zip Opened zip archive
+     *
+     * @return string basename of the used excel workbook
+     */
+    private function getWorkbookBaseName(ZipArchive $zip)
+    {
+        $workbookBasename = '';
+
+        // check if it is an OOXML archive
+        $rels = simplexml_load_string(
+            $this->securityScanner->scan(
+                $this->getFromZipArchive($zip, '_rels/.rels')
+            ),
+            'SimpleXMLElement',
+            Settings::getLibXmlLoaderOptions()
+        );
+        if ($rels !== false) {
+            foreach ($rels->Relationship as $rel) {
+                switch ($rel['Type']) {
+                    case 'http://schemas.openxmlformats.org/officeDocument/2006/relationships/officeDocument':
+                        $basename = basename($rel['Target']);
+                        if (preg_match('/workbook.*\.xml/', $basename)) {
+                            $workbookBasename = $basename;
+                        }
+
+                        break;
+                }
+            }
+        }
+
+        return $workbookBasename;
+    }
 }