Yes, it's sad that the PictView plugin is not updated.
I wrote an email back in August of 2017 telling them that PictView fails to correctly read a bunch of files:
Camera raw files of Olympus SH-2, Olympus XZ-2, Olympus XZ-10, Olympus E-M5 Mark II, Olympus E-PL7,
Olympus SP-570uz, Olympus E-PM2, Olympus OM-D-E M5.
It does not open .crw / .cr2 of Canon G7, Canon Powershot 650, Canon Powershot_Sx110is, Canon Ixus 900Ti,
Canon A550, Canon A570is, Canon A610, Canon A620, Canon A710, Canon A720is, Canon Powershot A650,
Canon S2is, Canon S3is, Canon SSis, Canon SD750,Canon SD950.
Most of the samples can be found at: http://raw.pixls.us/
Linking to libraries of Dcraw or libRaw would help.
Do you also plan support for further camera raw formats such as Panasonic .rw2, Sigma .x3f, Samsung .srw
Phase One .iiq, Hasselblad .3fr?
And do you also plan to support .DNG with CCD-Raw formats and different bit depth per channel
and support for mordern formats such as .webp, .bpg, .flif or new .heif format used by upcoming Apple devices?
But there was no response.
I think that they do not update it anymore which is sad