OS: Arch Linux x86_64
Generally PCManFM handles most things well, but I'm having some significant problems with other software, namely Calibre as well as yWriter (in wine). I checked the error windows using xwininfo and they were found to belong to PCManFM, not the software itself. Both these programs give me a dialog reading 'Error: No such file or directory.' for completing various tasks-- I have seen a report saying the same program functioned perfectly well in other DEs such as GNOME or KDE @ http://www.mobileread.com/forums/archive/index.php/t-172186.html, but I'm not prepared to install the whole of GNOME or KDE to test this.
Steps to reproduce:
1a. Use Calibre E-Book Reader to open a PDF format ebook or other filetype set for external viewing.
1b. Or; Use Calibre to "Open Containing Folder" on any ebook.
2. Confirm error message occurs.
3. Use "xwininfo -all" to demonstrate PID of error window belongs to PCManFM.
4. Confirm functionality on other DEs or with other file managers.