Henrik try this, hats off to jerson for a great find

step 1 made a folder called fossil, copied fossil.exe into it (rather than put it in the windows path)

step 2 ran {fossil new fossil/pbp.fossil}
got this
C:\Users\rc>fossil new fossil/pbp.fossil
project-id: adf8f538c6ca487edd847aee786a6032e350646a
server-id: c4bdc7ffab0f9f76cc944f05946861656111e406
admin-user: rc (initial password is "c06c08")

step 3
copied some pbp files into this folder
ran {fossil add .}
got a messAGE saying files added
ran {fossil commit -m "initial values"}
ran {fossil ui } , it opens browser see the files

step 4

edited a file and saved it [in that folder]
ran {fossil update}
ran {fossil commit -m "updated values"}
ran {fossil ui } , it opens browser with commented update ; lovely