diff --git a/4dev/tests/Check/CoreLibsCheckFileTest.php b/4dev/tests/Check/CoreLibsCheckFileTest.php
index c94ad943..56141aa2 100644
--- a/4dev/tests/Check/CoreLibsCheckFileTest.php
+++ b/4dev/tests/Check/CoreLibsCheckFileTest.php
@@ -28,10 +28,10 @@ final class CoreLibsCheckFileTest extends TestCase
 	public function filesList(): array
 	{
 		return [
-			['filename.txt', 'txt', 5],
-			['filename.csv', 'csv', 15],
-			['filename.tsv', 'tsv', 0],
-			['file_does_not_exits', '', -1],
+			['filename.txt', 'txt', 5, 'text/plain'],
+			['filename.csv', 'csv', 15, 'text/csv'],
+			['filename.tsv', 'tsv', 0, 'text/plain'],
+			['file_does_not_exits', '', -1, ''],
 		];
 	}
 
@@ -63,6 +63,15 @@ final class CoreLibsCheckFileTest extends TestCase
 		return $list;
 	}
 
+	public function mimeTypeProvider(): array
+	{
+		$list = [];
+		foreach ($this->filesList() as $row) {
+			$list[$row[0] . ' must be mime type ' . $row[3]] = [$row[0], $row[3]];
+		}
+		return $list;
+	}
+
 	/**
 	 * Tests if file extension matches
 	 *
@@ -115,6 +124,51 @@ final class CoreLibsCheckFileTest extends TestCase
 			unlink($this->base_folder . $input);
 		}
 	}
+
+	/**
+	 * Undocumented function
+	 *
+	 * @covers ::getMimeType
+	 * @dataProvider mimeTypeProvider
+	 * @testdox getMimeType $input must be mime type $expected [$_dataName]
+	 *
+	 * @param  string $input
+	 * @param  string $expected
+	 * @return void
+	 */
+	public function testGetMimeType(string $input, string $expected): void
+	{
+		if (!empty($expected)) {
+			$file = $this->base_folder . $input;
+			$fp = fopen($file, 'w');
+			switch ($expected) {
+				case 'text/csv':
+					for ($i = 1; $i <= 10; $i++) {
+						fwrite($fp, '"This is row","' . $expected . '",' . $i . PHP_EOL);
+					}
+					break;
+				case 'text/tsv':
+					for ($i = 1; $i <= 10; $i++) {
+						fwrite($fp, "\"This is row\"\t\"" . $expected . "\"\t\"" . $i . PHP_EOL);
+					}
+					break;
+				case 'text/plain':
+					fwrite($fp, 'This is mime type: ' . $expected . PHP_EOL);
+					break;
+			}
+			fclose($fp);
+		} else {
+			$this->expectException(\UnexpectedValueException::class);
+		}
+		$this->assertEquals(
+			$expected,
+			\CoreLibs\Check\File::getMimeType($this->base_folder . $input)
+		);
+		// unlink file
+		if (is_file($this->base_folder . $input)) {
+			unlink($this->base_folder . $input);
+		}
+	}
 }
 
 // __END__
diff --git a/www/admin/class_test.file.php b/www/admin/class_test.file.php
index f2c26c17..0844c4bf 100644
--- a/www/admin/class_test.file.php
+++ b/www/admin/class_test.file.php
@@ -37,6 +37,7 @@ $file = '/some/path/to/some/file.txt';
 print "GETFILENAMEENDING: $file: " . File::getFilenameEnding($file) . "<br>";
 $file = getcwd() . DIRECTORY_SEPARATOR . 'class_test.file.php';
 print "GETLINESFROMFILE: $file: " . File::getLinesFromFile($file) . "<br>";
+print "MIMEINFO: $file: " . File::getMimeType($file) . "<br>";
 
 print "</body></html>";
 
diff --git a/www/lib/CoreLibs/Check/File.php b/www/lib/CoreLibs/Check/File.php
index 36b4bfc8..c8bdc531 100644
--- a/www/lib/CoreLibs/Check/File.php
+++ b/www/lib/CoreLibs/Check/File.php
@@ -51,6 +51,23 @@ class File
 		// return lines in file
 		return $lines;
 	}
+
+	/**
+	 * get the mime type of a file via finfo
+	 * if file not found, throws exception
+	 * else returns '' for any other finfo read problem
+	 *
+	 * @param  string $read_file File to read, relative or absolute path
+	 * @return string
+	 */
+	public static function getMimeType(string $read_file): string
+	{
+		$finfo = new \finfo(FILEINFO_MIME_TYPE);
+		if (!is_file($read_file)) {
+			throw new \UnexpectedValueException('[getMimeType] File not found: ' . $read_file);
+		}
+		return $finfo->file($read_file) ?: '';
+	}
 }
 
 // __END__