Hello watchdogwatchdog wrote: some iso files on sdb1 which I can mount in other puppies are displayed with a red triangle and cannot be mounted. The boot.cat in bbpup iso is also displayed with a red triangle.
Have a look at what shared-mime-info package is built into this Puppy.
Most recent Puppies are built with quite an old .pet version of this package, but recently I experimented with compiling the latest version (1.9) from source. At first I thought it was OK but then I noticed exactly the same problem with some .iso files and the boot.cat files being red triangles.
I did this because I wanted to add a mime-type for .opus audio files.
In the end I went back to the old version of shared-mime-info and figured out how to add the mime-type by editing /usr/share/mime/packages/puppy.xml