diff --git a/SeedDMS_Core/Core/inc.FileUtils.php b/SeedDMS_Core/Core/inc.FileUtils.php
index ac09421b0..b9e6e638b 100644
--- a/SeedDMS_Core/Core/inc.FileUtils.php
+++ b/SeedDMS_Core/Core/inc.FileUtils.php
@@ -121,18 +121,22 @@ class SeedDMS_Core_File {
 	} /* }}} */
 
 	/**
+	 * Parses a string like '[0-9]+ *[BKMGT]*' into an integer
+	 * B,K,M,G,T stand for byte, kilo byte, mega byte, giga byte, tera byte
+	 * If the last character is omitted, bytes are assumed.
+	 *
 	 * @param $str
 	 * @return bool|int
 	 */
 	static function parse_filesize($str) { /* {{{ */
-		preg_replace('/\s\s+/', '', $str);
-		if(in_array(strtoupper(substr($str, -1)), array('B','K','M','G'))) {
-			$value = (int) substr($str, 0, -1);
-			$unit = substr($str, -1, 1);
-		} else {
-			return (int) $str;
-		}
-		switch(strtoupper($unit)) {
+		if(!preg_match('/^([0-9]+) *([BKMGT]*)$/', trim($str), $matches))
+			return false;
+		$value = $matches[1];
+		$unit = $matches[2] ? $matches[2] : 'B';
+		switch($unit) {
+			case 'T':
+				return $value * 1024 * 1024 * 1024 *1024;
+				break;
 			case 'G':
 				return $value * 1024 * 1024 * 1024;
 				break;
@@ -143,13 +147,21 @@ class SeedDMS_Core_File {
 				return $value * 1024;
 				break;
 			default;
-				return $value;
+				return (int) $value;
 				break;
 		}
 		/** @noinspection PhpUnreachableStatementInspection */
 		return false;
 	} /* }}} */
 
+	/**
+	 * @param $file
+	 * @return string
+	 */
+	static function file_exists($file) { /* {{{ */
+		return file_exists($file);
+	} /* }}} */
+
 	/**
 	 * @param $file
 	 * @return string