diff --git a/.logs/fnames_log.txt b/.logs/fnames_log.txt
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+Creating new file ./Programming_Languages/NodeJS/Configuring_applications.md to replace ./Programming_Languages/NodeJS/Configuring applications.md
+Creating new file ./Programming_Languages/NodeJS/Structuring_Express_applications.md to replace ./Programming_Languages/NodeJS/Structuring Express applications.md
+Creating new file ./Mathematics/Prealgebra/Mixed_and_improper_fractions.md to replace ./Mathematics/Prealgebra/Mixed and improper fractions.md
diff --git a/Mathematics/Prealgebra/Mixed and improper fractions.md b/Mathematics/Prealgebra/Mixed_and_improper_fractions.md
similarity index 100%
rename from Mathematics/Prealgebra/Mixed and improper fractions.md
rename to Mathematics/Prealgebra/Mixed_and_improper_fractions.md
diff --git a/Programming_Languages/NodeJS/Configuring applications.md b/Programming_Languages/NodeJS/Configuring_applications.md
similarity index 100%
rename from Programming_Languages/NodeJS/Configuring applications.md
rename to Programming_Languages/NodeJS/Configuring_applications.md
diff --git a/Programming_Languages/NodeJS/Structuring Express applications.md b/Programming_Languages/NodeJS/Structuring_Express_applications.md
similarity index 100%
rename from Programming_Languages/NodeJS/Structuring Express applications.md
rename to Programming_Languages/NodeJS/Structuring_Express_applications.md