diff --git a/CHANGELOG.md b/CHANGELOG.md
index b863b09..7022b8d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,7 +1,8 @@
 # 0.9.6 (2020-05-18)
 
-- Fix windows builds
-- Move to Github Actions instead of Travis
+-   Fix windows builds
+-   Case insensitive file extension matching
+-   Move to Github Actions instead of Travis
 
 # 0.9.5 (2020-04-08)
 
diff --git a/Cargo.lock b/Cargo.lock
index 468ea77..9bbbacf 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1008,7 +1008,7 @@ dependencies = [
 
 [[package]]
 name = "ripgrep_all"
-version = "0.9.13-alpha.0"
+version = "0.9.6-alpha.0"
 dependencies = [
  "bincode",
  "bzip2",
diff --git a/src/bin/rga.rs b/src/bin/rga.rs
index a0cc599..e0c844c 100644
--- a/src/bin/rga.rs
+++ b/src/bin/rga.rs
@@ -1,4 +1,5 @@
 use failure::Fallible;
+use log::*;
 use rga::adapters::spawning::map_exe_error;
 use rga::adapters::*;
 use rga::args::*;
@@ -75,8 +76,8 @@ fn main() -> Result<(), exitfailure::ExitFailure> {
         let extensions = adapters
             .iter()
             .flat_map(|a| &a.metadata().fast_matchers)
-            .filter_map(|m| match m {
-                FastMatcher::FileExtension(ext) => Some(ext as &str),
+            .flat_map(|m| match m {
+                FastMatcher::FileExtension(ext) => vec![ext.clone(), ext.to_ascii_uppercase()],
             })
             .collect::<Vec<_>>()
             .join(",");
@@ -94,10 +95,13 @@ fn main() -> Result<(), exitfailure::ExitFailure> {
         "--smart-case",
     ];
 
+    let exe = std::env::current_exe().expect("Could not get executable location");
+    let preproc_exe = exe.with_file_name("rga-preproc");
+
     let mut child = Command::new("rg")
         .args(rg_args)
         .arg("--pre")
-        .arg("rga-preproc")
+        .arg(preproc_exe)
         .arg("--pre-glob")
         .arg(pre_glob)
         .args(passthrough_args)
@@ -108,7 +112,7 @@ fn main() -> Result<(), exitfailure::ExitFailure> {
     Ok(())
 }
 
-/// add the directory that contains `rga` to PATH, so ripgrep can find rga-preproc and rga-preproc can find pandoc etc (if we are on Windows where we include dependent binaries)
+/// add the directory that contains `rga` to PATH, so rga-preproc can find pandoc etc (if we are on Windows where we include dependent binaries)
 fn add_exe_to_path() -> Fallible<()> {
     use std::env;
     let mut exe = env::current_exe().expect("Could not get executable location");
diff --git a/src/matching.rs b/src/matching.rs
index 71a7d4b..f7b3809 100644
--- a/src/matching.rs
+++ b/src/matching.rs
@@ -42,7 +42,7 @@ pub struct FileMeta {
 }
 
 pub fn extension_to_regex(extension: &str) -> Regex {
-    Regex::new(&format!("\\.{}$", &regex::escape(extension))).expect("we know this regex compiles")
+    Regex::new(&format!("(?i)\\.{}$", &regex::escape(extension))).expect("we know this regex compiles")
 }
 
 pub fn adapter_matcher<T: AsRef<str>>(