Unfortunately, the version 0.5.6 rev a of Grisbi for Windows introduce a critical issue.
At the second opening of a .GSB file you will get the message :
"Cannot open file ... : this is not a grisbi file"
The version 0.5.6 rev a for Windows has corrupted the .gsb file. This corrumpted can be fixed. Your data are not lost.
To fix this issue a update is available.
The easier way to fix the .gsb file is to open it with a updated version of grisbi 0.5.6. which will manage to fix the introduced format error.
The update package (grisbi-0.5.6-win32-gcc-050515-patch-050603.exe) is available for download on the official grisbi site
or directly at the follwoing address:
warning: this package DO NOT include the grisbi-0.5.6-win32-gcc-050515-patch-050602.exe one
Download it and run it to apply the update.
PS: It's possible to fix manually the corruption this way :
1 - Close Grisbi
2 - Open the .gsb file into notepad
3 - replace the string "Fi0hier_ouvert" by "Fichier_ouvert"
4 - Save and close the file