There are many alternatives to Thunar for Xfce if you are looking for a replacement. The best Xfce alternative is Xfe, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 50 alternatives to Thunar and four of them are available for Xfce so hopefully you can find a suitable replacement. Other interesting Xfce alternatives to Thunar are Rodent, Tux Commander and emelFM2.
X File Explorer (Xfe) is an MS-Explorer or Commander like file manager for X. It is based on the popular, but discontinued, X Win Commander, originally developed by Maxim Baranov.
What is Rodent?
Rodent is fast, small and powerful file manager for the GNU operating system (but it also works in BSD). That's one way to look at it. Another way is to call it a graphic shell (that's probably more accurate).
Rodent wastes no space on menus or function.
Tux Commander is a windowed file manager with 2 panels side by side similar to Double Commander, Total Commander or Midnight Commander.
It is a file manager for UNIX-like operating systems. It uses a simple and efficient interface pioneered by Norton Commander, in the 1980s.
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When I started xfe after changing the group with the sg command, it worked and I was able to delete the file. Thunar couldn't do this.