One of the suggested features implemented in Keepmark 1.10.0 is a preview of an excel files. The Excel files are very popuar, so quick preview of that files seems to be important for Keepmark users. It’s far from perfection but is pretty usable. Here is a sample preview:

Excel preview

Keepmark can display preview of spreadsheet saved as xls, xlsx but also ods (Open/Libre Office format). As part of this functionality I also added the ability to search the content of these documents.